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Table 1 comparison of the variables between the cases and controls

From: Folic acid level and preterm birth among Sudanese women

Variables The cases (n = 56) The controls (n = 56) P
The mean (SD)of    
Age, year 28.3 (6.2) 28.3 (5.9) 0.996
Parity 2.6 (2.7) 2.1 (1.7) 0.243
Body mass index, kg/m2 26.2(4.3) 26.4 (4.0) 0.825
Interpregnancy interval, month 24.4(18.7) 14.9 (10.2) 0.004
Hemoglobin, g/dl 10.0 (0.9) 10.2 (1.0) 0.229
Number (percentage)of    
Education < secondary level 39 (69.6) 29 (51.8) 0.051
Housewives 51 (91.1) 48 (85.7) 0.278
History of miscarriage 15 (26.8) 20 (35.7) 0.208
Lack of antenatal care 10 (18.2) 6 (10.9) 0.209