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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.