Table 2.

Descriptive data of demographic, sleep and fatigue variables by cluster.

	Milder sleep disturbance & milder fatigue (n = 61) M (SD)	Milder sleep disturbance & severe fatigue (n = 68) M (SD)	Severe sleep disturbance & milder fatigue (n = 15) M (SD)	Severe sleep disturbance & severe fatigue (n = 15) M (SD)

Sleep diary (14 days)
SOL	30.13 (31.58) ^a	28.77 (22.65) ^a	36.71 (30.06) ^a	64.79 (49.79) ^b	F (3, 155) = 6.27	p < .001^**
WASO	57.06 (29.24) ^a	59.23 (28.69) ^a	76.74 (47.57) ^b	95.12 (65.81) ^b	F (3, 155) = 5.56	p = .001^**
EMA	57.31 (37.82)	63.16 (40.28)	46.08 (42.67)	65.93 (67.83)	F (3, 155) = 0.82	p = .48
TWT	144.80 (61.58) ^a	151.02 (55.49) ^a	159.51 (65.77) ^a	225.84 (121.84) ^b	F (3, 155) = 6.08	p < .001^**
TIB	495.13 (42.00)	499.05 (35.00)	504.70 (67.05)	504.70 (43.15)	F (3, 155) = 0.81	p = .49
TST	350.98 (57.93) ^a	352.51 (65.31) ^a	346.42 (59.40) ^a	293.73 (116.53) ^b	F (3, 155) = 3.23	p = .02^*
% sleep efficiency	70.96 (11.80) ^a	69.59 (11.83) ^a	68.67 (12.18) ^a	55.65 (23.21) ^b	F (3, 155) = 5.52	p = .001^**
Sleep quality	2.92 (0.52) ^a	2.71 (0.54) ^{a, b}	3.06 (0.60) ^a	2.46 (0.61) ^b	F(3, 155) = 4.67	p = .003^**

SF-36 subscales
General health	85.91 (13.09) ^a	74.62 (16.11) ^b	80.20 (12.04) ^{a, b}	60.67 (21.63)^c	F (3, 155) = 13.07	p < .001^**
Physical functioning	93.43 (6.57) ^a	86.47 (12.81) ^a	93.00 (7.02) ^a	70.37 (29.63) ^b	F (3, 155) = 15.40	p < .001^**
Role physical	85.66 (27.56) ^a	52.94 (38.52) ^b	76.67 (30.57) ^a	29.44 (36.17) ^c	F (3, 155) = 16.66	p < .001^**
Bodily pain	77.82 (15.89) ^a	67.25 (20.32) ^a	74.80 (13.20) ^a	52.60 (22.89) ^b	F (3, 155) = 8.91	p < .001^**
Vitality	65.22 (15.24) ^a	38.82 (15.77) ^b	57.33 (15.68) ^a	36.00 (13.40) ^b	F (3, 155) = 37.23	p < .001^**
Social functioning	86.89 (19.15) ^a	66.54 (19.73) ^{b, c}	76.67 (17.59) ^{a, b}	59.17 (26.50) ^c	F (3, 155) = 14.32	p < .001^**
Role emotional	89.62 (26.20) ^a	66.92 (34.40) ^b	73.33 (42.16) ^{a, b}	44.44 (43.03) ^c	F (3, 155) = 9.45	p < .001^**
Mental health	76.67 (12.47) ^a	67.20 (12.50) ^b	71.47 (14.80) ^{a, b}	63.46 (13.56) ^b	F (3, 155) = 11.69	p < .001^**

Insomnia Severity Index
Interference of insomnia	2.07 (0.77) ^a	2.85 (0.72) ^{b, c}	2.40 (0.91) ^{a, b}	2.93 (0.73) ^c	F(3, 155) = 12.90	p < .001^**

p < .05

^**

p < .01

Note. Different letters indicate significant differences between clusters.