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Table 3 Demographic characteristics for responders and non-responders

From: Improving postal survey response using behavioural science: a nested randomised control trial

  Responders (N = 646) Non-Responders (N = 2056)
Group allocation
 Control 289 (44.7%) 1060 (51.6%)
 Intervention 357 (55.3%) 996 (48.4%)
Age (years)
 Mean (SD) 38.3 (11.9) 37.3 (10.7)
 Missing [n (%)] 0 (0%) 1 (0.0005%)
IMD score
 Mean (SD) 25.7 (16.0) 27.9 (17.7)
 Missing [n (%)] 39 (6.0%) 113 (5.5%)
IMD quintile
 Quintile 1 (most deprived) 156 (25.7%) 653 (33.6%)
 Quintile 2 176 (29.0%) 447 (23.0%)
 Quintile 3 128 (21.1%) 367 (18.9%)
 Quintile 4 88 (14.5%) 263 (13.5%)
 Quintile 5 (least deprived) 59 (9.7%) 213 (10.9%)
NHS site
 Manchester 513 (79.4%) 1577 (76.7%)
 London 133 (20.6%) 479 (23.3%)
Test result
 1st HPV+/normal cytology 505 (78.2) 1697 (82.5%)
 2nd/3rd HPV+/normal cytology 141 (21.8%) 359 (17.5%)
  1. Note: SD standard deviation, N number of participants, %: percentage