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Table 3 Differences in outcome measures between different napping behaviour for those who engage in a daytime nap at least once per day

From: Daytime napping associated with increased symptom severity in fibromyalgia syndrome

  Duration of daytime nap Intentional versus non-intentional napping
<30 minutes (N = 115) >30 minutes (N = 203) Test of difference Intentional N = 132 Non-intentional N = 276 Test of difference
Age (Mean) 50.63 (10.73) 45.82 (9.50) t = 4.44, p = 0.00 47.67 (9.40) 46.94 (10.40) t = 0.71, p 0.48
Sex (% Male) 8 (7.0%) 33 (11.3%) Χ = 1.6, p = 0.19 12 (9.10) 29 (10.5) X = 0.20, p = 0.66
Median number of children 0.00 (1.00) 1.00 (2.00) U = 9.69, p = 0.03 1.00 (2.00) 0.00 (2.00) U = 0.00, p = 1.00
Median years since diagnosis 7.00 (9.00) 8.00 (10.00) U = 16,902, p = 0.84 3.5 (5.0) 3.0 (5.0) U = 0.01, p = 0.98
Number of co-morbidities       
None (N, %) 17 (14.8%) 46 (15.7%) Χ =0.34, p = 0.84 17 (12.9) 46 (16.7) X = 1.20, p = 0.55
≤2 comorbidities (N, %) 61 (53.0%) 146 (49.8%)   71 (53.8) 136 (49.3)  
>2 comorbidities (N, %) 37 (32.2%) 101 (34.5%)   44 (33.3) 94 (34.1)  
MOS Sleep outcomes scale       
Mean sleep duration in hours 5:32 (01:38) 5:52 (02:03) t = −1.61, p = 0:11 6:02 (1:58) 5:39 (1:56) t = −1.78, p = 0.08
Mean sleep problems index I 69.94 (16.45) 70.93 (15.29) t = −0.58, p = 0.57 50.78 (16.34) 46.87 (14.48) t = 3.55, p = 0.00
Mean sleep problems index II 70.98 (16.54) 72.68 (14.76) t = −1.01, p = 0.31 45.03 (12.73) 42.00 (10.84) t = 4.02, p = 0.00
McGill Pain questionnaire       
Median sensory subscale 25.00 (8.00) 24.00 (6.50) U = 16,817, p = 0.82 22.00 (11.00) 25.00 (7.00) U = 21.11, p = 0.00
Median affective subscale 8.00 (4.00) 8.00 (4.00) U = 17,714, p = 0.81 7.5 (4.0) 8.00 (4.00) U = 4.35, p = 0.04
Median total score 33.00 (11.00) 32.00 (10.00) U = 17,342, p = 0.64 30.00 (9.00) 31.98 (9.00) U = 22.45, p = 0.00
FSS Fatigue severity       
Mean total score 56.72 (9.09) 58.05 (8.13) t = −1.43, p = 0.15 57.67 (8.36) 57.67 (8.57) t = 252.45, p = 1.00
EMQ-R Everyday memory       
Mean total score 32.15 (14.07) 36.97 (12.11) t = −3.45, p = 0.00 29.55 (6.64) 31.98 (7.08) t = 272.37, p = 0.10
HADS Mood       
Mean anxiety score 12.13 (4.44) 13.11 (4.18) t = −2.10, p = 0.04 12.30 (4.05) 13.12 (4.39) t = 2.22, p = 0.03
Mean depression score 10.59 (3.99) 11.66 (3.84) t = −2.50, p = 0.01 10.75 (3.42) 11.60 (4.01) t = 2.72, p = 0.01
  1. IQR = Interquartile range SD = Standard deviation.