Table 4. Logistic regression analysis relative to C-section risk in Robson groups G1, G2 and G5 at the HA and HB hospitals / SES-DF/Brazil, during the study period.

Models tested	OR	IC95%
G2 vs. G1	0.51	0.39–0.68
G5 vs. G1	0.55	0.43–0.70
G1 vs. G2	1.96	1.50–2.60
G5 vs. G2	1.07	0.85–1.35
G1 vs. G5	1.83	1.43–2.33
G2 vs. G5	0.93	0.74–1.18

Significative statistical results are highlighted in bold (p< 0.05)