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Table 3 Distribution of controls and cases of maternal morbidity according to selected obstetric factors

From: Severe maternal morbidity: a case-control study in Maranhao, Brazil

Proximal variables Cases n (%) Controls n (%) χ2 OR (95% CI) p - value
Number of consultations  
≥ 6 51 (41.8) 135 (55.3)   1.00  
4-5 42 (34.4) 67 (27.5)   1.65 (1.00-2.74)  
1-3 19 (15.6) 27 (11.1)   1.86 (0.95-3.63)  
0 9 (7.4) 13 (5.3)    
Not informed* 1 (0.8) 2 (0.8)    
    6.14   0.11
Hypertension during gestation  
No 72 (59.0) 207 (84.8)   1.00  
Yes 41 (33.6) 24 (9.8)   4.84 (2.73-8.50)  
No prenatal care /not informed* 9 (7.4) 13 (5.3)    
    33.20   <0.001
Reference to high risk prenatal care  
No 71 (58.2) 202 (82.8)   1.00  
Yes 42 (34.4) 29 (11.9)   4.12 (2.39-7.11)  
No prenatal care/ not informed* 9 (7.4) 13 (5.3)    
    28.07   <0.001
  1. * The missing information was not considered for the assessment of χ2.
  2. Sao Luis, Brazil, 2009.