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Table 2 Comparisons between those who nap daily on a regular basis and those who do not

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

  Regular daily nap (N = 408) Non regular nap (N = 636) Test of difference
  Median (Interquartile range)  
Number of children 1.00 (2.00) 0.00 (2.00) U = 3.02, P = 0.82
Years since diagnosis 7.00 (10.00) 7.00 (9.00) U = 0.50, p = 0.52
McGill Pain questionnaire    
Sensory subscale (Median, IQR) 24.00 (7.00) 22.00 (7.00) U = 102,640, p = 0.00
Affective subscale (Median, IQR) 8.00 (4.00) 7.00 (4.00) U = 105,928, p = 0.00
Total score median (Median, QR) 32.00 (9.75) 29.00 (11.00) U = 101,372, p = 0.00
  Frequency (%)  
Male gender 41 (10%) 37 (5.8%) χ = 6.44, p = 0.01
Number of co-morbidities    
None 63 (15.4%) 140 (22.0%) Χ = 13.83, p = 0.00
≤2 Co-morbidities 207 (50.7%) 341 (53.6%)
>2 Co-morbidities 138 (33.8%) 155 (24.4%)
  Mean  
(Standard deviation)
Age 47.17 (10.08) 46.75 (10.59)
MOS Sleep outcomes scale    
Sleep duration in hours 5:47 (01:57) 6:04 (01:48) t = 2.45, p = 0.02
Sleep problems index I 70.65 (15.61) 61.65 (16.95) t =8.63, p = 0.00
Sleep problems index II 72.20 (15.28) 63.42 (16.71) t =8.57, p = 0.00
FSS Fatigue severity    
Total score 57.67 (8.42) 53.72 (10.47) t = −6.41, p = 0.00
EMQ-R Everyday memory    
Total score 35.61 (12.86) 30.91 (13.51) t = −5.59, p = 0.00
HADS Mood    
Anxiety subscale 12.84 (4.27) 11.77 (4.37) t = −3.89, p = 0.00
Depression subscale 11.36 (3.90) 9.83 (14.14) t = −5.94, p = 0.00