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Table 1 Participants’ characteristics per strategy

From: Recruiting families for an intervention study to prevent second-hand smoke exposure in children

Strategy Questionnaire A communities
n = 6,987
Questionnaire A physicians
n = 3,013
MIKADO
n = 202
Schools
n = 32,000
Total
42,202
Response (n (%)) 1,012 (15) 887 (29) 104 (51) 1,540 (5) 3543 (8)
Primary caregiver responder:
- Mother (n (%)) 843 (83) 757 (85) 87 (84) 1,244 (81) 2,931 (83)
- Father (n (%)) 158 (16) 120 (14) 14 (14) 271 (18) 563 (16)
- Other (n (%)) 11 (1) 10 (1) 3 (3) 25 (2) 49 (1)
Age of children (mean (SD)) 6.2 (4.1) 7.6 (4.2) 9.2 (2.3) 8.1 (2.5) 7.5 (3.6)
Age of mother (mean (SD)) 38.9 (6.3) 40.3 (5.6) Not asked 39.8 (5.1) 39.8 (5.7)c
Highest parental educationa
- Low (n (%)) 31 (3) 41 (5) 23 (22) 41 (3) 136 (4)
- Middle (n (%)) 268 (27) 262 (30) 50 (48) 405 (29) 985 (28)
- High (n (%)) 404 (40) 454 (51) 28 (27) 730 (45) 1,616 (46)
- Academic (n (%)) 300 (30) 126 (14) 3 (3) 332 (22) 761 (21)
- Other (n (%)) 0 0   32 (2) 32 (1)
- Missing (n (%)) 9 (1) 4 (1)    13 (0)
Active smoking of both parents (n (%))b 306 (16) 257 (15) 141 (70) 507 (17) 1,211 (34)
Active smoking at least one parent per family (n (%)) 250 (25) 210 (24) 104 (100) 390 (25) 954 (27)
Smoking in the presence of the child (n (%)) 131 (13) 135 (15) 104 (100) 141 (9) 511 (14)
Wheezing ever (n (%)) 283 (28) 255 (29) 29 (28) 478 (31) 1,045 (29)
Wheezing in the past 12 months (n (%)) 144 (14) 114 (13) 7 (7) 229 (15) 494 (14)
Asthma diagnosis (n (%))c 66 (13) 65 (12) 0 161 (11) 292 (8)
Respiratory tract infection in the past 12 months (n (%)) 413 (41) 278 (31) Not asked 567 (37) 1,258 (37)d
Asthma in the first degree relative (n (%)) 258 (26) 215 (24) 104 (100) 423 (28) 1,000 (28)
  1. a Parental education definition: Low: range no education to lower vocational education; Middle: range general secondary education to middle vocational education; High: range higher general secondary education to high vocational education; Academic: university education. b prevalence calculated from the total amount of parents individually in each group (Questionnaire A community: 1925 parents, Questionnaire A physicians: 1718 parents, MIKADO: 202 parents, Schools: 2929 parents); c only children 6 years and older included (questionnaire A community: 515 children, Questionnaire A physicians: 557 children; d prevalence calculated from n = 3439 due to exclusion of n = 104 children form the MIKADO group