Table 2.

Previous pregnancy characteristics

Factors	Term (n = 263) (%)	Preterm (n = 59) (%)	OR (95% CI)	P-value
Parity
≥ 4	4 (1.5)	4 (6.8)	4.709 (1.143–19.407)	0.019
< 4	259 (98.5)	55 (93.2)
Previous preterm
Yes	20 (15.6)	12 (35.3)	2.945 (1.259–6.891)	0.010
No	108 (84.4)	22 (64.7)
Interpregnancy interval (months)
< 24	14 (10.9)	2 (5.7)	0.506 (0.110–2.342)	0.357
≥ 24	114 (89.1)	33 (94.3)