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Table 1 Demographic variables of responders and non-responders of the general population and responders of the clinical population

From: Psychometric properties and norm scores of the sleep self report in Dutch children

  General population Clinical population
  Responders (n = 619)
Mean (SD)/N (%)
Non-responders (n = 397)
Mean (SD)/N (%)
p-valuea Responders (N = 34)
Mean (SD)/N (%)
p-valueb
Child age in years 9.9 (1.7) 10.1 (1.7) 0.16 9.2 (1.6) 0.02
Female sex 285 (46.0) 182 (45.8) 0.95 14 (41.2) 0.58
Socio-economic status    0.54   0.14
 - Low 83 (13.4) 46 (11.6)   4 (11.8)  
 - Middle 293 (47.3) 184 (46.3)   11 (32.4)  
 - High 240 (38.8) 166 (41.8)   19 (55.9)  
 - Missing 3 (0.5) 1 (0.3)   -  
Chronic physical and/or mental disorder 138 (22.3) N/A N/A 22 (64.7)c < 0.01
Use of sleep medication 11 (1.8) N/A N/A 12 (35.3) < 0.01
  1. SD Standard deviation, N/A Not available
  2. ap-value for difference between responders and non-responders
  3. bp-value for difference between responders in the norm population and the clinical population
  4. cpercentage based on number of complete cases for that item