Table 4.

Odds ratios and 95% confidence intervals of preterm birth severity according to maternal exposure to serious life events during pregnancy, Lima, Peru, 2009–2010

Life events	Controls (n=480)	Very PTB 32 weeks (n=135)		Moderate PTB 32–33 weeks (n=78)		Late PTB 34–36 weeks (n=266)
	n	n	OR* (95% CI)	n	OR* (95% CI)	n	OR* (95% CI)
Death of a first-degree relative/significant other
No	440	114	1.00 (referent)	65	1.00 (referent)	224	1.00 (referent)
Yes	40	21	1.92 (1.03–3.56)	13	2.42 (1.81–4.97)	42	2.15 (1.34–3.47)
Divorce or separation
No	465	125	1.00 (referent)	74	1.00 (referent)	247	1.00 (referent)
Yes	15	10	1.85 (0.74–4.60)	4	1.77 (0.56–5.60)	19	2.35 (1.16–4.76)
Fired or forced to change job
No	459	132	1.00 (referent)	71	1.00 (referent)	255	1.00 (referent)
Yes	21	3	0.48 (0.13–1.79)	7	2.33 (0.93–8.82)	11	0.96 (0.45–2.06)
Financial trouble or bankruptcy
No	433	101	1.00 (referent)	62	1.00 (referent)	200	1.00 (referent)
Yes	47	34	2.72 (1.59–4.68)	16	2.26 (1.18–4.32)	66	2.91 (1.91–4.43)
Serious fight or argument with partner
No	366	84	1.00 (referent)	41	1.00 (referent)	150	1.00 (referent)
Yes	114	51	2.03 (1.31–3.16)	37	2.95 (1.78–4.90)	116	2.51 (1.81–3.49)
Wedding of a close relative/friend
No	415	121	1.00 (referent)	73	1.00 (referent)	215	1.00 (referent)
Yes	65	72	0.83 (0.44–1.58)	5	0.44 (0.17–1.15)	51	1.59 (1.06–2.40)
Any of the serious life events
No	290	63	1.00 (referent)	34	1.00 (referent)	99	1.00 (referent)
Yes	190	72	1.72 (1.13–2.62)	44	2.03 (1.23–3.36)	167	2.65 (1.92–3.65)
1	107	32	1.45 (0.87–2.42)	20	1.67 (0.90–3.07)	64	1.80 (1.21–2.68)
2	61	27	1.82 (1.02–3.26)	13	1.87 (0.91–3.82)	76	3.74 (2.46–5.69)
3+	22	13	2.88 (1.29–6.41)	11	4.78 (2.01–11.3)	27	3.96 (2.11–7.46)
P for trend			0.003		<0.001		<0.001

Note:

^*Adjusted for maternal age, prepregnancy weight, pregnancy not planned and not receiving prenatal care.

Abbreviations: CI, confidence interval; OR, odds ratio; PTB, preterm birth.