Table 1

Characteristics of the study population by country and exposure to dampness/moisture damage at school

SpainThe NetherlandsFinland
School exposureDamaged (n=1425)Non-damaged (n=1333)Damaged (n=1146)Non-damaged (n=1305)Damaged (n=1903)Non-damaged (n=2159)
Girls678 (48%)659 (49%)593 (52%)685 (52%)1006 (53%)1098 (51%)
Age (mean (SD) in years)9.1 (1.8)8.8 (1.7)9.2 (1.8)8.9 (1.8)10.0 (1.8)10.0 (1.9)
BMI (mean (SD) in kg/m2)†17.9 (3.0)17.5 (3.0)16.5 (2.4)16.4 (2.5)17.5 (3.0)17.6 (2.9)
Both parents from another country217 (15%)132 (10%)*57 (5%)192 (15%)*20 (1%)24 (1%)
Low parental educational level673 (49%)570 (44%)*440 (40%)512 (42%)986 (53%)1007 (48%)*
Parental history of asthma232 (18%)208 (17%)246 (22%)271 (21%)327 (18%)356 (17%)
Parental history of nasal allergies†488 (37%)505 (41%)*625 (55%)667 (52%)1156 (64%)1335 (65%)
Parental history of skin allergies†588 (44%)612 (49%)*550 (49%)622 (48%)1006 (56%)1163 (57%)
Moisture damage in the home‡267 (19%)261 (20%)292 (25%)303 (23%)156 (8%)171 (8%)
Passive smoking in the home424 (30%)346 (26%)*165 (15%)163 (13%)5 (0.3%)3 (0.1%)
Older siblings612 (43%)620 (47%)602 (53%)666 (51%)1141 (60%)1279 (59%)
Current pet keeping542 (39%)451 (35%)*613 (54%)570 (44%)*917 (49%)849 (40%)*
Physical activity§810 (60%)809 (64%)*762 (69%)878 (70%)1642 (86%)1852 (87%)
  • Number (%) are given, unless otherwise specified.

  • †More than 5% missing (5–10%).

  • ‡Water damage and/or wet or damp spots on surfaces and/or mould on surfaces and/or mouldy odour at home in the last 12 months.

  • §Exercise outside school hours more than once a week.

  • *p<0.05 for difference between pupils from damaged and non-damaged schools (χ2 test).

  • BMI, body mass index.