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Table 1 Baseline characteristics

From: Does a monetary incentive improve the response to a postal questionnaire in a randomised controlled trial? The MINT incentive study

  Incentive
n = 1070 (%)
No incentive
n = 1074 (%)
Centre of recruitment to MINT   
   Hospital A 102 (9.5) 104 (9.7)
   Hospital B 51 (4.8) 46 (4.3)
   Hospital C 156 (14.6) 188 (17.5)
   Hospital D 42 (3.9) 36 (3.4)
   Hospital E 61 (5.7) 78 (7.3)
   Hospital F 54 (5.0) 53 (4.9)
   Hospital G 69 (6.4) 64 (6.0)
   Hospital H 98 (9.2) 90 (8.4)
   Hospital I 62 (5.8) 55 (5.1)
   Hospital J 21 (2.0) 22 (2.0)
   Hospital K 130 (12.1) 112 (10.4)
   Hospital L 53 (5.0) 49 (4.6)
   Hospital M 22 (2.1) 23 (2.1)
   Hospital N 80 (7.5) 82 (7.6)
   Hospital O 69 (6.4) 72 (6.7)
Time point of recruitment   
   4 month questionnaire 590 (55.1) 604 (56.2)
   8 month questionnaire 480 (44.9) 470 (43.8)
Age, years; mean [sd] 37.0 [13.4] 36.8 [13.2]
   range 18–87 18–78
Sex male 448 (41.9) 456 (42.5)
   Female 613 (57.3) 606 (56.4)
   Missing 9 (0.7) 12 (1.1)
WAD grade at ED assessment   
   I 572 (53.5) 617 (57.4)
   II 465 (43.5) 429 (39.9)
   III 33 (3.1) 28 (2.6)