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

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

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