## 5 Discussion  
According to this study the significant effect of increasing parents' access to vaccination-related information by employing a newly designed child vaccination chatbot. A child vaccination chatbot can be used as a useful tool as it can increase parents' motivation and intention to vaccinate their children. Parents in the experimental group showed higher scores for the four variables compared to the control group. Our results suggest that engaging parents with an interactive tool in a familiar technological environment may improve vaccination rates. In the second quarter of 2019, Kakao Talk had 44.417 million users [17]. One of the main characteristics of Kakao Talk is that it can be used habitually and helps users interact conveniently with services such as chatbots. Moreover, it can promote social networking and emotional exchange among members [26]. There is an active research stream regarding health promotion based on Kakao Talk, and the beneficial effects of using this platform have been suggested in a previous study [25]. Through this study, parents who missed their vaccination scheduled were interviewed to determine the functional needs that could be applied to upgrade the chatbot. Through the Kakao Plus Friend Service, notification messages were sent automatically to parents when their child's vaccination date was imminent, and users were provided weekly information related to vaccinations regularly, including articles, newsletters, and webtoons. The service also included information about the location of the nearest vaccination center and local healthcare institutions. The most important factor for increasing child vaccinations seemed to be providing accurate information promptly. Data were collected through prior research on child vaccination at the KCDC. Parents who missed a child's vaccination date indicated a high demand for continuously provided information on vaccinations. Based on the interviews, the chatbot's algorithm was revised and updated to meet users' needs even as the study was ongoing. Further adjustments should be made to ensure the best use of the platform. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Variable**} & \multirow{2}{*}{**Group**} & \multicolumn{2}{c}{**Post-Test**} & \multicolumn{2}{c}{**Post-Test**} & \multicolumn{2}{c}{**Post-Test**} \\  & & **(After 4 Weeks)** & & **(After 8 Weeks)** & & **(After 12 Weeks)** \\ \cline{3-7}  & & **Mean \(\pm\) SD** & **t, _p-Value_** & **Mean \(\pm\) SD** & **t, _p-Value_** & **Mean \(\pm\) SD** & **t, _p-Value_** \\ \hline \multirow{3}{*}{Knowledge} & Exp & 6.13 \(\pm\) 2.63 & \(-\)4.27 & 8.29 \(\pm\) 2.15 & \(-\)7.26 & 8.74 \(\pm\) 1.70 & \(-\)10.00 \\  & Con & 3.34 \(\pm\) 2.55 & \(<\)0.001 & 4.44 \(\pm\) 2.06 & \(<\)0.001 & 3.88 \(\pm\) 2.14 & \(<\)0.001 \\ \multirow{3}{*}{Motivation} & Exp & 2.83 \(\pm\) 0.83 & \(-\)3.28 & 3.21 \(\pm\) 0.57 & \(-\)7.19 & 3.63 \(\pm\) 0.38 & \(-\)9.81 \\  & Con & 2.17 \(\pm\) 0.77 & \(<\)0.05 & 2.28 \(\pm\) 0.45 & \(<\)0.001 & 2.45 \(\pm\) 0.56 & \(<\)0.001 \\ \multirow{3}{*}{Self-Efficacy} & Exp & 3.22 \(\pm\) 0.68 & \(-\)2.26 & 3.59 \(\pm\) 0.34 & \(-\)7.74 & 3.76 \(\pm\) 0.34 & \(-\)8.47 \\  & Con & 2.66 \(\pm\) 1.23 & \(<\)0.05 & 2.66 \(\pm\) 1.26 & \(<\)0.001 & 2.43 \(\pm\) 0.82 & \(<\)0.001 \\ \multirow{3}{*}{Behavioral} & Exp & 4.22 \(\pm\) 0.98 & \(-\)5.23 & 4.64 \(\pm\) 0.48 & \(-\)9.48 & 4.71 \(\pm\) 0.41 & \(-\)9.65 \\ \cline{1-1}  & Con & 2.69 \(\pm\) 1.32 & \(<\)0.001 & 2.64 \(\pm\) 1.09 & \(<\)0.001 & 2.76 \(\pm\) 1.07 & \(<\)0.001 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Outcome variables in the experimental and control group (n = 63). According to this research, providing personalized real-time information based on the changes of child's age was essential. Furthermore, it is important to notify parents promptly of their child's vaccination schedule.