Table 3.

Logistic regression for type of birth in ethnographic sample of 80 women in Pelotas, 1993. Values are odds ratios (95% confidence intervals) unless stated otherwise

	Adjusted level
Characteristic*	Crude	1	1-2	1, 2, and 4
Level 1
Maternal schooling	1.22 (1.05 to 1.42; P=0.01)	1.19 (1.00 to 1.42; P=0.05)	1.11 (0.9 to 1.3; P=0.25)	1.00 (0.9 to 1.3; P=0.6)
Family income (n=77)	1.29 (1.05 to 1.60; P=0.02)	1.16 (0.92 to 1.50; P=0.22)	†	†
Level 2
Maternal power	2.40 (1.43 to 4.0; P=0.008)	2.20 (1.27 to 3.80; P=0.005)	2.10 (1.3 to 3.6; P=0.005)	2.0 (1.1 to 3.5; P=0.02)
Level 3
Gestational risk	0.90 (0.7 to 1.12; P=0.36)	1.0 (0.8 to 1.3; P=0.9)	†	†
Primiparous	2.50 (0.9 to 6.9; P=0.08)	1.7 (0.6 to 5.1; P=0.3)	†	†
Level 4
Maternal medicalisation	2.81 (1.51 to 5.22; P=0.001)	2.62 (1.40 to 5.00; P=0.003)	2.20 (1.17 to 4.22; P=0.01)	2.00 (1.00 to 4.00; P=0.05)
No of antenatal consultations	1.29 (1.06 to 1.57; P=0.01)	1.28 (1.04 to 1.57; P=0.02)	1.28 (1.04 to 1.57; P=0.02)	1.22 (1.0 to 1.50; P=0.07)

^*Change in odds ratio associated with each unit change (for all variables included in model). 

^†Variable excluded from model because significance level >0.2 at first level of adjustment.