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. 2007 Aug;85(8):615–622. doi: 10.2471/BLT.06.032334

Table 2. Sociodemographic characteristics of cases and controls.

Characteristic Cases 
(n = 84) Controls 
(n = 84) P-value
Age (years)
Mean (SD) 29.1 (8.0) 25.8 (7.2) 0.005
Educational level (%) 0.388
< 7 years 16.7 9.5
≥ 7 years 67.9 69.0
No data 15.5 21.4
Marital status (%) 0.67
Married/in union 50.6 52.4
Single/other 33.7 36.6
No data 15.7 11.0
Gravidity (%) 0.021
0 12.3 29.3
1–3 42.0 39.0
≥ 4 45.7 31.7
Abortions (%) 0.096
0 64.6 76.5
≥ 1 35.4 23.5
Caesarean sections (%)
0 68.8 78.8 0.349
1 13.8 10.0
≥ 2 17.5 11.3

SD, standard deviation.