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Analysis of variance (ANOVA) by group: N = no item endorsed (N = 1,935); O = occasional use (N = 354); I = intensive use (N = 103); Scheffé-test: a); 1) F(2) = 11.79; p < .001; 2) p < .10; 3) F(2) = 4.65; p = .01; 4) F(2) = 6.42; p = .002, N>O>I; 5) F(2) = 34.86; p < .001; N>O>I; 6) n.s.; 7) F(2) = 4.93; p = .007; *** p ≤ .001; **p ≤ .01; *p ≤ .05.
