Table 2. Metaregression of weight changes per period in drug-naive patients.

Period	aripiprazole	olanzapine	Quetiapine	risperidone	placebo
≤6 wk*	0	0	0	0	0
6–16 wk	0.15 (−1.55–1.27)	1.30 (−2.34–4.93)	0.09 (−6.47–6.65)	−1.26 (−6.83–4.32)	0.24 (−0.69–1.17)
16–38 wk		−1.19 (−5.00–2.63)	−2.34 (−9.95–5.27)	−1.30 (−6.83–−4.23)	−0.38(−1.48–0.71)
>38 wk		5.41 ( 0.17–6.13 )	−0.98 (−8.70–6.74)	2.31 (−3.38–7.91)	−0.36 (−2.0–1.29)

The coeffecient indicates the changes of weight compared with the constant (period 1).

*constant is period 1 that serves as reference in change.

Data in italics indicate 95% confidence interval.

The outcome in bold indicate significant difference in weight change of reference category.