Incidence, temporal trends and risk factors of puerperal infection in Mainland China: a meta-analysis of epidemiological studies from recent decade (2010–2020)

Table 4 The source of heterogeneity among included studies identified by meta- regression

Study characteristics^a	Gestational hypertension		GDM		Caesarean section		PROM
Study characteristics^a	b coefficient	P value	b coefficient	P value	b coefficient	P value	b coefficient	P value
Sample size	-0.91	0.07^b	-0.88	0.08^b	-0.36	0.22	-0.44	0.26
Hospital levels	-0.81	0.15	-0.60	0.31	-0.76	0.01^b	-1.17	< 0.01^b
Median year of data collection	-0.73	0.28	0.26	0.67	0.10	0.69	0.01	0.97
Study design	-0.48	0.46	-0.53	0.42	0.71	0.03^b	-1.13	0.01^b
JBI scores	-0.32	0.37	-0.29	0.42	-0.21	0.34	-0.52	0.06^b

^aThe grouping of JBI scores was consistent with that in Table 5
^bThe study characteristic was the source of heterogeneity among included studies on the corresponding risk factors of PI (P < 0.10)

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