3.4.4.1. Effective size
For the control group, 7.5% showed an effective size exceeding 2.000, which indicated that they actively participated in interaction and had strong control over and influence on other parents. The community childcare doctor had the largest effective size, at 16.086, and parent 1104, parent 1224, parent 1128, and parent 1145 showed the largest effective sizes among the parents, at 4.545, 4.000, 3.688, and 3.071, respectively. Seventeen (25.8%) parents had effective sizes between 2.000 and 1.000, which demonstrated that they seldom participated in group interaction. Forty-four (66.7%) parents had an effective size of 0.000, meaning they merely viewed the communications without participating.For the intervention group, 23.7% of the members had effective sizes larger than 2.000, which indicated that they actively participated in the interactions and had strong control over and influence on other parents. The community childcare doctor had the largest effective size, at 40.976, and among the parents, parent 1119, parent 1074, parent 1196, parent 1004, parent 1146, and parent 1222 had the largest effective sizes, at 13.387, 11.274, 9.442, 8.545, 8.000, 6.938, and 6.467, respectively. Meanwhile, some parents had effective sizes of 3.000–5.000. Thirty-four (44.7%) parents had effective sizes between 2.000 and 1.000, demonstrating that they seldom participated in the group interaction. Twenty-four (31.6%) parents had an effective size of 0.000, meaning they only viewed the communications and did not participate in them.Comparing the control group to the intervention group showed that, besides the community childcare doctor, more parents from the intervention group improved their knowledge about children aged 0–3 years, and the intervention-group parents' participation activity increased after receiving the health education.