The effectiveness of pediatric obesity prevention policies: a comprehensive systematic review and dose–response meta-analysis of controlled clinical trials

Table 3 Details of non-linear association between BMI and BMI-Z_score with study specific parameters

BMI^a_{Mean difference}	Coefficient	Standard error	t	P >\|t\|	95% Conf. Interval
Education time
Dose_1	0.3085	0.1785	1.73	0.100	− 0.0652, 0.6822
Dose_2	0.0855	0.0588	1.45	0.163	− 0.0376, 0.2087
_cons	0.6306	0.1707	3.69	0.002	0.2733, 0.9879
Physical activity hour^b
Dose_1	0.2787	0.2893	0.96	0.350	− 0.3347, 0.8921
Dose_2	− 1.0968	0.9264	− 1.18	0.254	− 3.0608, 0.8671
_cons	0.6516	0.1710	3.81	0.002	0.2889, 1.0142
Duration of intervention
Dose_1	− 1.0312	0.2833	− 3.64	0.001	− 1.6001, − 0.4624
Dose_2	− 0.2733	0.0730	− 3.74	< 0.001	− 0.4200, − 0.1267
_cons	0.8181	0.1377	5.94	< 0.001	0.5415, 1.0946
BMI-Z_{score Mean difference}
Education time
Dose_1	− 0.1331	0.1319	− 1.01	0.325	− 0.4075, 0.1413
Dose_2	0.0523	0.0462	1.13	0.270	− 0.0437, 0.1484
_cons	− 0.0395	0.0416	− 0.95	0.353	− 0.1261, 0.0470
Physical activity hour^b
Dose_1	− 0.0103	0.0128	− 0.80	0.435	− 0.0377, 0.0171
Dose_2	− 0.0043	0.0055	− 0.77	0.452	− 0.0162, 0.0075
_cons	0.0291	0.0287	1.01	0.327	− 0.0321, 0.0903
Duration of intervention
Dose_1	0.7926	0.3537	2.24	0.030	0.0788, 1.5064
Dose_2	− 0.3482	0.1474	− 2.36	0.023	− 0.6458, − 0.0505
_cons	0.0487	0.0307	1.58	0.121	− 0.0134, 0.1108

The significant P-values of Dose_2 are presented as italic numbers
^aBody mass index
^bThis refers to the hours of physical activity other than the normal physical activity that takes place in the school's physical activity course

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