Table 2.

Response Rates Overall and by Baseline Characteristics, by Condition

	Standard MTF		Web-Push Condition
	%	SE	%	SE	P-value
Total (overall)	35.125	0.006	39.074	0.006	<0.001
Follow-up number (age)
1 (age 19/20)	31.105	0.014	43.868	0.015	<0.001
2 (age 21/22)	32.384	0.014	36.023	0.015	N.S.
3 (age 23/24)	32.489	0.014	39.498	0.015	<0.001
4 (age 25/26)	36.844	0.015	35.373	0.015	N.S.
5 (age 27/28)	36.933	0.015	39.083	0.015	N.S.
6 (age 29/30)	41.149	0.015	40.528	0.015	N.S.
Sex
Male	30.984	0.008	33.464	0.009	<0.05
Female	39.134	0.008	44.137	0.009	<0.001
Race/ethnicity
White	40.444	0.008	42.835	0.008	N.S.
Black	24.630	0.016	28.624	0.017	N.S.
Hispanic	27.789	0.014	33.310	0.015	<0.05
Other	30.776	0.017	40.127	0.017	<0.001
Parent education
High school or less	28.857	0.011	32.941	0.011	<0.05
Some college/more	38.434	0.007	42.234	0.007	<0.001
4-year college plans
Not definitely	29.415	0.009	30.927	0.009	N.S.
Definitely	39.775	0.008	45.427	0.008	<0.001
Any lifetime substance use
Alcohol	32.929	0.007	37.097	0.007	<0.001
Cigarettes	28.362	0.009	32.242	0.009	<0.01
Marijuana	28.525	0.008	33.460	0.009	<0.001
Other illicit drugs	28.626	0.011	35.022	0.011	<0.001

Note. P-value is for significance test for respective differences between rates across rows. N.S.=nonsignificant.