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Table 1 Baseline characteristics of the daytrip trial

From: The effect of two lottery-style incentives on response rates to postal questionnaires in a prospective cohort study in preschool children at high risk of asthma: a randomized trial

  Daytrip No Daytrip Total
N 384 387 771
Male, n (%) 207 (53.9) 225 (58.1) 432 (56)
Age yrs, mean (SD)* 2.25 (1.2) 2.29 (1.2) 2.27 (1.2)
Nr of symptoms at onset, N (%)
1 ** 257 (66.9) 261 (67.4) 518 (67.2)
2 *** 97 (25.3) 98 (25.3) 195 (25.3)
3 **** 30 (7.8) 28 (7.2) 58 (7.5)
Nr of Questionnaires #
2 21 (5.5) 17 (4.4) 38 (4.9)
3 42 (10.9) 42 (10.9) 84 (10.9)
4 321 (83.6) 328 (84.8) 649 (84.2)
Level of education of parents, N (%)
Lowest 8 (2.1) 8 (2.1) 16 (2.1)
Low 56 (14.6) 61 (15.8) 117 (15.1)
Medium 144 (37.5) 146 (37.7) 290 (37.6)
High 149 (38.8) 148 (38.2) 297 (38.5)
No information 27 (7.0) 24 (6.2) 51 (6.6)
Allergy or asthma parents
At least one parent with allergy or asthma 222 (57.8) 230 (59.4) 452 (58.6)
No information 25 (6.5) 23 (5.9) 48 (6.2)
Ethnicity of parents
Western 116 (30.2) 112 (29.0) 228 (29.6)
Non-western 182 (47.4) 205 (53.0) 387 (50.2)
No information 86 (22.4) 70 (18.1) 156 (20.2)
  1. * Range of age 1–5 in all groups.
  2. **Cough or wheeze or shortness of breath.
  3. *** Cough & wheeze or cough & shortness of breath or wheeze & shortness of breath.
  4. **** Cough & wheeze & shortness of breath.
  5. # Depending on age at onset, a participant was intended to fill in 2, 3 or 4 questionnaires.