Stress, Violence, Depression, and Low Social Support and Their Association with Preterm Birth in a Brazilian Cohort

Table 2

Relative risk for preterm birth in multivariate analysis.

Variable	Adjusted RR	95% CI
		LL	UL
Smoking
No	Ref	Ref	Ref
Yes	1.44	0.92	2.24
Stress
Mild	Ref	Ref	Ref
Moderate	1.14	0.70	1.86
Severe	1.65	0.97	2.81
Number of stressful life events
None	Ref	Ref	Ref
1 or 2	1.03	0.68	1.54
3 or more	1.25	0.73	2.13
Depression
Irrelevant symptoms	Ref	Ref	Ref
Possibly depressed	1.03	0.65	1.63
Probably depressed	0.95	0.56	1.59

RR: relative risk; LL: lower limit; UL: upper limit.