Table 2.

Parental characteristics of those with a live birth (s)

	early rescue ICSI		ICSI
	n/mean	%; 95 % CI/range (SD)	n/mean	%; 95 % CI/range (SD)
Total deliveries	186		693
Singletons	143	76.9; 70.8–83.0	485	70.0; 66.6–73.4
Twins	43	23.1; 17.0–29.2	208	30.0; 26.6–33.4
Female age (years)	30.9	24–41(3.5)	30.3	20–43(3.8)
Male age (years)	32.8	25–46(3.8)	32.2	22–51(4.5)
Duration of infertility (years)	5.8	0.5–18(3.6)	4.7	0.5–17(3.1)
Pattern of infertility
Primary	133	71.5; 65.0–78.0	537	77.5; 74.4–80.6
Secondary	53	28.5; 22.0–35.0	156	22.5; 19.4–25.6
Body Mass Index (BMI)	21.9	17.2–33.7(2.6)	21.7	15.6–38.9(2.7)