Table 3.

Group Social Context by Class (N=615)

Class	Limited Vulnerabilitya	Aggression Vulnerabilityb	Substance Usersc	Impaired Driversd	Multi-Issuee	χ2 / F
Special Occasion
Overall yes	30.9c,e	39.8	45.0a,d	25.0c,e	54.5a,d	15.5**
Comparison by gender (n=245)
% all female groups	29.7	46.3	25.2	33.3	23.3	8.7
% all male groups	25.0	19.5	23.4	0.0	30.0
% mixed gender groups	45.3	34.1	51.4	66.7	46.7
Group knowledge
Average report	3.72b,c,e	4.06a	3.91a	3.93	4.07a	2.85*
Group prior clubbing
Average report	3.72b,c,e	4.09a	3.93a	3.93a	4.07a	3.30*
Assessment of Safety
Entry
Lowest report	3.11b,e	2.91a,c	3.11b,e	3.25e	2.73a,c,d	5.90**
Discrepancy	0.58b,e	0.79a,e	0.68e	0.58e	1.11a,b,c,d	7.89**
Exit
Average report	3.64b,c,e	3.45a,c,d	3.75a,b,e	3.72b,e	3.46a,c,d	12.18**
Lowest report	3.35b,e	3.11a,c	3.45b,e	3.50e	2.93a,c,d	9.43**
Highest report	3.89b	3.79a,c,d	3.95b	4.00b	3.89	4.59**
Discrepancy	0.54e	0.68c,e	0.50b,e	0.50e	0.96a,b,c,d	6.51**
Same Night Characteristics
Responsible person (% no)	10.6	5.8	12.2	16.7	7.3	4.3
Regularly drunk person (% yes)	59.5	62.0	88.6	83.3	87.3	61.7**
Percent concerned (M)	42.2b,e	51.3a	44.6e	35.3e	58.0a,c,d	3.2*
Expectation for group drinking (M)	1.6b,c,e	1.4a,c,e	2.2a,b	1.9	2.0a,b	20.2**
Expectation discrepancy group drinking (M)	0.8e	0.8e	0.9e	0.8e	1.3a,b,c,d,	5.7**
Expectation for group drugging (M)	0.2c,e	0.2e	0.3a	0.5	0.4a,b	3.1*
Expectation discrepancy group drugging (M)	0.2c,e	0.3	0.3a	0.2	0.4a	3.8**
Expectation for self drinking (M)	1.2b,c,d,e	0.9a,c,d,e	2.0a,b,e	1.8a,b	1.7a,b,c	43.6**
Expectation discrepancy self drinking (M)	1.0e	1.0e	1.1e	1.2	1.5a,b,c	3.2**

^**p < .01

^*p < .05

Superscript letters indicate classes significantly different from each other via post hoc analyses