Table 5.

Odds of being a participant at age 33 based on BMI, sex, and social group at age 12

	Odds ratioa of being a participant in 2000–2001	95% CI	p value
BMI	0.98	0.91–1.06	0.63
Sex	1.82 (females relative to males)	1.21–2.74	0.004
Social group II	0.71 (relative to social group I)	0.41–1.21
Social group III	0.40 (relative to social group I)	0.22–0.72	0.002
Social group IV	0.27 (relative to social group I)	0.11–0.65

^aOdds ratio of being a participant comparing subjects with unit difference in BMI.