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. 2011 Apr 12;104(9):1500–1504. doi: 10.1038/bjc.2011.113

Table 1. Baseline characteristics of women in the matched cohort study.

Characteristic Incident smokers (n=38) Matched controls (n=76)
Mean age (years) 17.4 17.7
     
No. of sexual partners (%)
 0 1 (3) 1 (1)
 1 20 (53) 56 (74)
 2 12 (32) 7 (9)
 3 5 (13) 9 (12)
 4 0 (0) 0 (0)
 5 0 (0) 1 (1)
 >6 0 (0) 2 (3)
Mean no. of sexual partners 1.9 1.1
     
Age at first sexual intercourse (years) (%)
 <13 0 (0) 1 (1)
 14 4 (11) 3 (4)
 15 5 (13) 8 (11)
 16 12 (32) 31 (41)
 17 10 (26) 19 (25)
 18 7 (18) 9 (12)
 19 0 (0) 4 (5)
 Not applicable 0 (0) 1 (1)
Mean age at first sexual intercourse (years) 16.3 16.5
Mean number of samples tested (range) 2.5 (2–6) 2 (2–2)