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Table 1 Baseline characteristics and response rates

From: Response rate of patient reported outcomes: the delivery method matters

  Stringent/intention to treat As treated
Email (N = 202) Hybrid (N = 204) Mail (N = 196) Email (N = 201) Hybrid (N = 151) Mail (N = 250)
Sex (female) 98 (49%) 107 (53%) 91 (46%) 97 (48%) 76 (50%) 123 (49%)
Age
  < 50 yrs. 11 (5%) 11 (5%) 9 (5%) 10 (5%) 11 (7%) 10 (4%)
 50–59 yrs. 40 (20%) 40 (20%) 38 (20%) 39 (19%) 35 (23%) 44 (18%)
 60–69 yrs. 62 (31%) 63 (31%) 61 (31%) 67 (33%) 53 (35%) 66 (26%)
 70–79 yrs. 68 (34%) 70 (34%) 67 (34%) 60 (30%) 41 (27%) 104 (42%)
  > 79 yrs. 21 (10%) 20 (10%) 21 (11%) 25 (12%) 11 (7%) 26 (10%)
Education level
 Low 55 (27%) 78 (38%) 84 (43%) 64 (32%) 48 (32%) 105 (42%)
 Middle 59 (29%) 52 (26%) 51 (26%) 57 (28%) 42 (28%) 63 (25%)
 High 88 (44%) 72 (35%) 60 (31%) 80 (40%) 60 (40%) 80 (32%)
Time since last visit
  < 5 yrs. 126 (62%) 125 (61%) 120 (61%) 122 (60%) 91 (60%) 160 (64%)
  ≥ 5 yrs. 76 (38%) 79 (39%) 76 (39%) 81 (40%) 60 (40%) 90 (36%)
Response rate
 Stringent 75 (37%) 77 (38%) 112 (57%)    
 After 1st reminder 91 (45%) 119 (58%) 118 (60%) 85 (42%) 77 (51%) 166 (66%)
 After telephone call 126 (62%) 136 (67%) 125 (64%) 120 (60%) 94 (62%) 173 (69%)
Different delivery method
 Email 4 20    
 Mail 25 49    
  1. Baseline characteristics of the three delivery methods for the stringent, intention to treat and as treated analysis are shown. The stringent response rate considered patients who switched delivery method as non-responders. In the intention to treat analysis patients are grouped in the delivery method category they were assigned to. In the as treated patients were grouped their actual delivery method category, since some patients had requested a different delivery method. Time since the last visit shows the years since the last consultation in the hospital
  2. yrs years