Table 3.

Percentage of pregnancies and odds ratios predicting incidence of pregnancy, by pregnancy-intentions measure, according to sex, Mission Teen Health Project, San Francisco, California, 2001–04

Pregnancy-intentions measure	Pregnancies (n = 72) among 263 girls			Pregnancies (n = 50) among partners of 181 boys
	% of pregnancies		Odds ratio	% of pregnancies		Odds ratio
Single-item measure
Wantedness
Definitely no (r)	73		1.00	68		1.00
Probably no	8		0.91	18		2.64
Probably yes	19		9.68***	9		2.75
Definitely yes a	0			5
Partner wantedness
Definitely no (r)	49		1.00	53		1.00
Probably no	24		2.73**	20		1.69
Probably yes	17		3.69***	11		1.32
Definitely yes	10		4.65**	16		6.01***
Happiness
Very unhappy (r)	40		1.00	29		1.00
Somewhat unhappy	28		1.39	29		1.78
Somewhat happy	19		0.88	20		0.78
Very happy	14		2.26*	22		6.76***
Likelihood
No likelihood (r)	51		1.00	33		1.00
Low likelihood	25		1.21	30		1.31
Medium likelihood	10		1.45	17		2.93*
High likelihood	14		6.68***	20		6.32***
Dual-item measure
Wantedness and partner’s wantedness
Neither want (r)	49		1.00	50		1.00
Partner only: some wantedness	24		2.50**	18		1.63
Respondent only: some wantednessb	0			2
Both: some wantedness	27		4.11***	30		3.34*
Wantedness and happiness
No wantedness nor happiness (r)	40		1.00	26		1.00
No wantedness, some happiness	33		0.90	42		1.31
Some wantedness, no happiness b	0			5
Some wantedness and happiness	28		2.42*	28		3.38
Wantedness and likelihood
No wantedness nor likelihood (r)	44		1.00	30		1.00
No wantedness, some likelihood	29		1.33	39		1.50
Some wantedness, no likelihood b	7			2
Some wantedness and likelihood	20		3.15**	30		4.53**

^*Significantat p ≤ 0.05;

^**p ≤ 0.01;

^***p ≤ 0.001. (r) = Reference category.

^aCategory was collapsed with “probably yes” in calculation of OR.

^bCategory was omitted in calculation of OR because too few pregnancies occurred.