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Table 2 Demographic characteristics for the whole sample (overall and by intervention and control group) (N = 2702)

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

Variable Control Intervention Total
Total 1349 (49.9%) 1353 (50.1%) 2702 (100%)
Age (years)
 Mean (SD) 37.4 (10.8) 37.6 (11.1) 37.5 (11.0)
 Missing [n (%)] 1 (0.074%) 0 (0%) 1 (< 0.001%)
IMD score
 Mean (SD) 28.2 (18.2) 26.5 (16.5) 27.3 (17.4)
 Missing [n (%)] 67 (5.0%) 85 (6.3%) 152 (5.6%)
IMD quintile (N = 2550, 94.4%)
 Quintile 1 (most deprived) 435 (33.9%) 374 (29.5%) 808 (31.7%)
 Quintile 2 279 (21.8%) 344 (27.2%) 623 (24.5%)
 Quintile 3 259 (20.2%) 236 (18.6%) 495 (19.4%)
 Quintile 4 178 (13.9%) 173 (13.7%) 351 (13.8%)
 Quintile 5 (least deprived) 131 (10.2%) 141 (11.1%) 271 (10.6%)
NHS site (N = 2702, 100%)
 Manchester 1043 (77.3%) 1047 (77.4%) 2090 (77.4%)
 London 306 (22.7%) 306 (22.6%) 612 (22.6%)
Cervical screening test result (N = 2702, 100%)
 1st HPV+/normal cytology 1103 (50.1%) 1099 (49.9%) 2202 (81.5%)
 2nd/3rd consecutive HPV+/normal cytology 246 (49.2%) 254 (50.8%) 500 (18.5%)
  1. Note. SD standard deviation, number of participants, %: percentage
  2. Cervical screening test result was dichotomised to receiving a 1st HPV+/normal cytology test result vs. a 2nd or 3rd consecutive HPV+/normal cytology test result