Discriminate validity of FOSQ, based on ESS. A scale rating of up to 11 (ESS < 11, Group 1) indicates a low incidence of daytime sleepiness, while larger values indicate a high incidence of daily sleepiness (ESS ≥ 11, Group 2).

Table 4: Discriminate validity of FOSQ, based on ESS. A scale rating of up to 11 (ESS < 11, Group 1) indicates a low incidence of daytime sleepiness, while larger values indicate a high incidence of daily sleepiness (ESS ≥ 11, Group 2).

FOSQ	ESS	n	Mean ± sd
Activity	ESS < 11	222	3.1 ± 0.7	p < 0.001
Activity	ESS ≥ 11	75	2.5 ± 0.8	p < 0.001
Vigilanc	ESS < 11		2.9 ± 1	p < 0.001
Vigilanc	ESS ≥ 11		2 ± 1.1	p < 0.001
Gen. prod	ESS < 11		3.3 ± 0.9	p < 0.001
Gen. prod	ESS ≥ 11		2.7 ± 0.8	p < 0.001
Soc. Out	ESS < 11		3.5 ± 0.8	p < 0.001
Soc. Out	ESS ≥ 11		3.1 ± 0.9	p < 0.001
Sex. resp	ESS < 11		2.9 ± 1.3	p = 0.001
Sex. resp	ESS ≥ 11		2.3 ± 1.4	p = 0.001
Summ	ESS < 11		15.8 ± 3.7	p = 0.007
Summ	ESS ≥ 11		12.8 ± 3.8	p = 0.007

(The statistical significant difference is p < 0.05).