Table 2.

Relationships between pre-pregnancy body mass index and C-section in all participants and by height group

All participants (N = 965)* (N = 965)*	N (%)	aOR (95%CI)
Body Mass Index
18.5 ≤ BMI < 25.0	495 (51.3)	ref
18.5 > BMI	11 (1.1)	-
25.0 ≤ BMI < 30.0	335 (34.7)	1.82 (1.16–2.87)
BMI ≥ 30.0	124 (12.9)	1.85 (1.02–3.38)
Maternal height ≥ 150 cm (N = 641)**
Body Mass Index
18.5 ≤ BMI < 25.0	338 (52.7)	ref
18.5 > BMI	8 (1.3)	-
25.0 ≤ BMI < 30.0	220 (34.3)	2.55 (1.42–4.58)
BMI ≥ 30.0	75 (11.7)	2.64 (1.23–5.66)
Maternal height < 150 cm (N = 324)***
Body Mass Index
18.5 ≤ BMI < 25.0	157 (48.5)	ref
18.5 > BMI	3 (1.0)	-
25.0 ≤ BMI < 30.0	115 (35.5)	1.02 (0.49–2.15)
BMI ≥ 30.0	49 (15.0)	1.13 (0.43–2.98)

^aOR: adjusted Odds Ratio by age, parity, altitude and JUNTOS, CI: Confidence Intervals

*Residual intraclass correlation (ICC)= 0.087

** ICC= 0.085

*** ICC= <001