Table 3.

Bulimic behaviors by concordant/discordant exposure of early risky behaviors in the total sample (ns and percentages [in parentheses] are given).

	N (in twins)	Bulimic Behaviors
Early Alcohol Experimentation
Concordant Unexposed	2718	536 (19.87)
Discordant Unexposed	288	64 (22.30)
Discordant Exposed	288	96 (33.45)
Concordant Exposed	238	70 (29.79)
Early Regular Alcohol Use
Concordant Unexposed	3236	674 (20.98)
Discordant Unexposed	116	28 (24.14)
Discordant Exposed	116	46 (40.35)
Concordant Exposed	50	16 (32.00)
Early Nicotine Experimentation
Concordant Unexposed	1830	327 (18.04)
Discordant Unexposed	439	97 (22.20)
Discordant Exposed	439	127 (29.06)
Concordant Exposed	818	213 (26.20)
Early Regular Nicotine Use
Concordant Unexposed	2872	582 (20.43)
Discordant Unexposed	202	47 (23.38)
Discordant Exposed	202	55 (27.50)
Concordant Exposed	234	75 (32.05)
Early Daily Nicotine Use
Concordant Unexposed	3026	617 (20.55)
Discordant Unexposed	181	54 (30.00)
Discordant Exposed	181	54 (30.17)
Concordant Exposed	130	37 (28.46)
Early Cannabis Experimentation
Concordant Unexposed	3144	648 (20.76)
Discordant Unexposed	142	40 (28.17)
Discordant Exposed	142	51 (35.92)
Concordant Exposed	98	26 (26.53)
Any Early Nicotine/Cannabis Experimentation
Concordant Unexposed	1818	323 (17.97)
Discordant Unexposed	440	98 (22.37)
Discordant Exposed	440	127 (29.00)
Concordant Exposed	840	218 (26.11)
Any Early Substance Experimentation
Concordant Unexposed	1678	290 (17.44)
Discordant Unexposed	454	95 (21.02)
Discordant Exposed	454	128 (28.38)
Concordant Exposed	948	253 (26.86)
Early Sex
Concordant Unexposed	2994	611 (20.57)
Discordant Unexposed	193	52 (27.08)
Discordant Exposed	193	57 (29.69)
Concordant Exposed	128	38 (29.92)