Background

Unintentional injury is a major public health problem for children in China. In 2016, over 15,000 children under five years old died from unintentional injury in China [1].

Poor supervision skills, poor caregiver perception of child injury risk, and risky child behaviors are reported as major risk factors for preschooler unintentional injury [2,3,4]. A systematic review indicated the most effective parenting interventions to reduce young children’s injuries were provided within the home using multi-faceted interventions [5]. However, interventions that have proven effective in other countries – including both multifaceted home-based interventions as well as other programs (e.g., child restraint legislation [6]; providing safe places away from water for young children; installing barriers controlling access to water [7]) – have not been widely implemented in China, largely due to lack of governmental support for injury control [8,9,10].

The rapid development of mobile health (mHealth) strategies, plus extensive smartphone penetration among Chinese parents, offers an opportunity to overcome barriers to child injury prevention in China since empirically-supported parenting interventions could be delivered broadly and cost-effectively to caregivers using mobile health technology. According to official statistics, over 1.2 billion Chinese were accessing to internet through smartphones in March, 2018 [11]. A recent systematic review by Omaki et al. [12] provides evidence of the effectiveness of computer-based communication in conveying information and influencing risk perception and safety behaviors; the review is support by empirical research from an RCT that concluded an intervention with web-based, tailored, safety advice combined with personal counseling is more effective than generic written materials to promote parents’ safety behavior for safe staircases, storage of cleaning products, bathing, drinking hot fluids, and cooking [13].

Few smartphone app interventions have been developed to help parents prevent unintentional injuries among their children, and most existing app-based interventions focus on a specific injury cause such as road traffic injury [14,15,16], or fire [14] and burn [17] prevention. All were conducted in high-income countries (HICs) and all were assessed only with knowledge, perception and behavioral outcomes. The present study extends the field to a middle-income country [18] and includes injury morbidity as a primary outcome.

Objectives

This proposed study aims to evaluate the effectiveness of an app-based intervention developed based on relevant scientific theories (e.g., Theory of Planned Behavior, the Haddon Matrix, and the Mobile Learning framework) to prevent unintentional injury incidence among preschoolers through changing parental behavior. We also sought to improve safety-related knowledge, attitudes, and behaviors of the caregivers.

Method

Study design

A single-blinded, 6-month follow-up, parallel-group cluster randomized controlled trial with 1:1 allocation ratio will be implemented in Changsha, China. This study will be conducted, analyzed and reported according to the Consolidated Standards of Reporting Trials (CONSORT) 2010 statement: extension to cluster randomized trials [19] and strict adherence to the Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT) guidelines (Details of the SPIRIT 2013 Checklist is provided in Additional file 1) [20]. Ethical approval for the study was obtained from the Ethics Committee of ** and implementing a framework of participatory simulation for mobile learning using scaffolding. Educational Technology & Society. 2012;16(3):137–50." href="/article/10.1186/s12889-018-5790-1#ref-CR30" id="ref-link-section-d178858445e929">30], and a needs assessment that consists of focus groups and online surveys among key stakeholders (including local caregivers of preschoolers and preschool teachers).

This intervention comprises four active modules: (a) content learning, (b) interaction, (c) survey and feedback, and (d) personal modules.

  1. a.

    Content learning: Content learning includes lessons to teach caregivers basic knowledge concerning prevention of ten common causes of unintentional injuries: exposure to animate mechanical forces (including animal bites and being trampled or bumped into by another person); exposure to inanimate mechanical forces (including pinched, cut or punctured by lifts and other objects); falls (including falls from heights); contact with heat and hot substances; exposure to smoke, fire and flames; transport accidents; accidental threats to breathing; unintentional poisoning by and exposure to noxious substances; unintentional drowning and submersion; and exposure to electric currents.

We will convey empirically-supported injury prevention knowledge to caregivers using strategies developed through focus groups among caregivers, discussion among content experts, and pilot testing. The needs assessment will guide decisions concerning the modes of training (e.g., through short written statements with pictures, cartoon vignettes, video testimonials, interactive games) and the length of each aspect of knowledge disseminations (expected to be somewhere in the 2–5 min range).

Parents will access knowledge-based learning through the “recommended knowledge” module on the app’s homepage (Fig. 3a, the app homepage was translated into English appears in Additional file 2) and will be reminded about unread knowledge module components through notifications that pop up on the smartphone screen when participants turn on the app (Fig. 3b). Further, caregivers will have the option to bookmark knowledge dissemination components by clicking a star on the bottom right corner of their screen (Fig. 3c), permitting access from their homepage to read/view knowledge components at convenient times. When participants fail to use the app for more than 1 month, an alert will be sent via text-message to their smartphones. To avoid contamination between participants in the intervention and control groups, all app-based programming will be restricted for use to assigned accounts for each participant, with sharing features disabled between participants (and between the participants with non-participants) throughout the study period.

  1. b.

    Interaction: Three modules will be created to facilitate communication between users (study participants) and between users and injury prevention experts: the forum module, the expert consultation module, and the user comments module. The forum module (Fig. 3d) will allow users to read and discuss specific topics with each other. Two forum topics will be released each week, one for parenting skills outside injury prevention (released to both intervention and control group) and the other focused specifically on unintentional injury prevention (intervention group only). A week later, discussion records will be reviewed by an expert in injury prevention and parenting, who will answer questions presented on each topic and provide expertise on the matter.

Fig. 3
figure 3

Homepage of app intervention. Note: The app homepage was translated into English appears in Additional file 2. Eight images within the figure were derived from the app “Baohusan” that has been developed by the research team for unintentional injury prevention among preschool students and will be tested in this trial

Full size image

The online expert consultation module (Fig. 3e) will be organized to focus on a particular topic related to injury prevention for the intervention group each month. In it, caregivers will ask experts questions through online chatting and the expert will provide private and individualized responses.

Finally, users may provide comments below each knowledge dissemination to offer another method for caregivers to communicate with each other.

  1. c.

    Survey and feedback: The questionnaire module (Fig. 3f) will support online data collection. The module will incorporate several strategies to encourage questionnaire completion. If an online questionnaire is not completed, a reminder notice will appear on the scroll screen when the user turns on the app. Further, automated text messages will be delivered to users 1 week before completion deadlines.

Customer service agents will be available daily (7.5 h on weekdays and 6 h on weekends, except for national holidays), using app-based online chatting to support users and help them solve any technical problems on use of the app. Outside of working hours, users will be able to access FAQs (Frequently Asked Questions) through an automated response system (Fig. 3g).

  1. d.

    Personal modules: Research suggests health education compliance and health behavior change is more likely if users can engage personally and feel “connected” to the program [31]. Thus, we will allow participants to select the color of the interface in their app according to their preferences (e.g., pink, yellow, blue) (Fig. 3h).

Approaches to increase compliance to the intervention

Four approaches will be implemented to encourage participation and increase compliance with using the app. First, participants will be awarded virtual currency during use, which can be exchanged for incentives such as wireless internet fees for smartphone and data use. Second, participants who complete log-ins for 7 days, as recommended, will be entered into a lottery to win additional virtual currency prizes. Third, coordinating teachers at each preschool will remind participants to use the app through multiple school-family communication platforms weekly (e.g., social media platforms). Finally, we will offer monthly awards to the three students in each classroom whose caregivers use the app with the greatest frequency with a small gift (about 5 Chinese Yuan).

Feasibility testing

Prior to the formal experiment, 20 caregivers of preschoolers will be recruited for feasibility testing, 10 in the intervention group and 10 in the control group. Following a two-week pilot testing period, participants will be asked to complete an online usability/feasibility questionnaire that addresses their evaluations of the contents, readability, app functions, app interfaces and operability of the app. The results of testing will guide refinement of the app and survey questionnaires prior to the full study.

Primary outcome measure

The primary outcome measure will be the incidence of unintentional injury among preschoolers in the prior 3 months, as collected both at 3-month and 6-month follow-up visits. Following previous epidemiological studies [32], we define an injury event as one that meets any of the following criteria: (i) child receives medical treatment by a doctor or other medical professional following an injury; (ii) child receives first aid by a family member, teacher or other non-medical staff following an injury (e.g. takes medication, receives massage or hot compress); and/or (iii) child is restricted from school or other activities, or is kept in bed/rest for more than a half-day following an injury.

Our primary outcome variable will be unintentional injury incidence, calculated as

$$ \frac{\mathrm{Number}\ \mathrm{of}\ \mathrm{preschoolers}\ \mathrm{experiencing}\ \mathrm{an}\ \mathrm{unintentional}\ \mathrm{in}\mathrm{jury}\ \mathrm{in}\ \mathrm{the}\ \mathrm{prior}\ \mathrm{three}\ \mathrm{months}}{\mathrm{Total}\ \mathrm{number}\ \mathrm{of}\ \mathrm{children}\ \mathrm{that}\ \mathrm{the}\ \mathrm{recruited}\ \mathrm{caregivers}\ \mathrm{look}\ \mathrm{after}}\kern0.5em \times \kern0.5em 100\% $$

Given cultural patterns in China, we anticipate most participants will be caregivers who oversee one single child who meets inclusion criteria, and most families will have just one preschooler when the caregivers are recruited. If an adult caregiver takes care of more than one preschooler, we will enroll only the youngest child when calculating injury incidence. Along with recording injury counts (frequency), we will code external causes of unintentional injury based on the International statistical Classification of Diseases and related health problems 10th revision (ICD-10) [33].

Secondary outcome measures

We will collect data on several secondary outcomes measures, as detailed below.

  1. (1)

    Caregiver attitudes toward unintentional injury prevention and safety behaviors among preschoolers will be assessed through a 17-item questionnaire. Items will focus on attitudes over the past week; the instrument was validated in previous epidemiological studies and is considered reliable and valid [34, 35]. Two items focus on caregivers’ attitudes for unintentional injury prevention and are assessed using a 4-point scale (completely, partly, not at all, don’t know): (a) Do you think child unintentional injury is largely preventable? and (b) Do you think you can help keep your child free from unintentional injuries? The remaining fifteen items assess caregiver report on the frequency of child’s risky behaviors over the past week, both indoors and outdoors (e.g., leave the child alone in the bathtub; require the child to use a helmet, wrist guard and other protective equipment when riding a bicycle, e-bike, or motorcycle).

  2. (2)

    Caregiver report on economic losses due to unintentional injury will be measured through a 5-item questionnaire that assesses both direct economic costs caused by unintentional injury (medical treatment expenses; transportation expenses to and from hospital/clinic; payment to hire other persons to take care of the injured child; accommodation expenses for the caregivers who look after hospitalized children) and indirect economic costs that are the consequence of unintentional injury events (e.g., caregiver economic loss from being off work).

  3. (3)

    We will also consider the Incremental Cost-Effectiveness Ratios (ICERs) for the app-based unintentional injury intervention. Cost-effectiveness analysis of the app-based unintentional injury intervention will follow National Institute for Health and Clinical Excellence (NICE) guidance on cost-effectiveness evaluation of public health interventions [36]. We will collect data on capital and time costs. Economic costs will consist of subsidies to the researchers and teachers paid by this project, costs for develo** and maintaining the app-based interventions, and costs for efforts to increase compliance to using the app-based interventions Caregiver’s time costs will be collected retrospectively for the 6-month follow-up. Because many caregivers may be reluctant or untruthful in reporting their exact wages (individual incomes are regarded as highly private information by many adults in China), we will use the average salary in Changsha, China to calculate the product of total lost months due to taking care of the injured children to estimate the indirect economic loss for adult caregivers because of being off work.

The app-based unintentional injury intervention will be compared to app-based non-injury intervention to assess the incremental costs and benefits of implementing the intervention [37]. The ICERs are calculated as the cost difference between the intervention group and the control group divided by the difference in the number of children experiencing unintentional injury events between the two arms during the prior 6 months (after combining data from the two follow-up surveys). Bootstrap sampling will be used to calculate 95% uncertain interval of the ICERs.

Data collection

Data will be collected at three time points: baseline, 3 months post-intervention, and 6 months post-intervention. All data will be collected through app-based online surveys and will be stored in the backend database of app with password limiting the access. If caregivers fail to complete app-based surveys, we will provide printed paper questionnaires to participants through the support of facilitating teachers. In addition, an independent app-based survey among a sample of 100 caregivers will be conducted at each time period to test the reproducibility of collected data.

We also will collect compliance data through electronic strategies embedded in the app. These will include frequency of login, length of time using the app at each log-in, the number of knowledge disseminations used and listed as bookmarks, the number of published comments, and so on.

Data analysis plan

Analysis will follow the intention-to-treat approach [38]. Descriptive data (mean, standard deviation, median, inter-quartile range, proportion) will be calculated to describe the characteristics of primary and secondary outcome measures and covariates. Chi-square test (categorical outcomes) and two sample independent t-test (continuous outcomes) will examine differences in unintentional injury incidence and other outcome indicators between the two arms at each time point (baseline, 3 months, 6 months). Chi-square test (categorical outcomes) and analysis of variance for repeated measurement data (continuous outcomes) will detect differences across the three time points for each arm.

The primary analysis will be conducted through Generalized Estimation Equation (GEE) models, which will test the effectiveness of the app-based intervention based on the interaction of group (intervention vs. control) with time (baseline, 3 months, 6 months) after adjusting for socio-demographic variables (age, sex, household income) and compliance to the intervention (use of the app-based interventions).

Missing values will be imputed using the Expectation Maximization algorithm (EM). To test the robustness of results, sensitivity analysis will be conducted by comparing primary and secondary outcome data collected through the online app-based survey and those completed using a printed questionnaire survey. Statistical analysis will be performed through Stata/IC 12.1. Statistical significance will be based on 2-sided tests at the level of 0.05.

Planned subgroup analysis

Subgroup analyses will be performed to assess the impact of demographic factors, including gender, age, type of children’s caregivers (e.g., parents, grandparents, others), education level of caregivers, and household income per capita per month. Subgroup analyses will follow primary analyses.

Discussion

Smartphone apps are emerging as an effective, low-cost platform to disseminate health and safety information [39, 40]. They offer great potential for injury prevention, particularly in countries and regions where injury control resources are limited but smartphone penetration is high.

This trial is designed to evaluate the effectiveness of an app-based intervention to prevent unintentional injuries to preschool-aged children in Changsha, China. The app-based intervention targets caregivers by educating them about the most common unintentional injury causes for Chinese preschoolers. It is developed based on relevant theories [28,29,30], empirical research evidence, and a systematic needs assessment, and it is anticipated that it will result in both knowledge acquisition and behavior change on the part of the caregivers. Unlike most published trials, it will use injury incidence as the primary outcome measure.

We also will conduct economic analyses to demonstrate the cost benefit of the app. If our hypotheses prove true, we anticipate the app could be readily and cost-effectively disseminated across China, yielding substantial public health benefit by reducing unintentional injuries among preschoolers [12].