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Table 1 Personal and environmental characteristics of the baseline study population, those lost to follow-up, the 6-year cohort and the 20-year cohort, the espoo cohort study 1991–2011, Finland

From: Allergic diseases and asthma in the family predict the persistence and onset-age of asthma: a prospective cohort study

 

Baseline

Lost to follow-up

6-year cohort

Lost to follow-up

20-year cohort

Participation in all surveys

No. (% of baseline population)

2568 (100.0)

584 (22.7)

1984 (77.3)

945 (36.8)

1623 (63.2)

1298 (50.5)

Age (years)

  1

424 (16.5)

100 (17.1)

324 (16.3)

156 (16.5)

268 (16.5)

210 (16.2)

  2

405 (15.8)

104 (17.8)

301 (15.2)

147 (15.6)

258 (15.9)

199 (15.3)

  3

411 (16.0)

92 (15.8)

319 (16.1)

145 (15.3)

266 (16.4)

211 (16.3)

  4

400 (15.6)

67 (11.5)

333 (16.8)

159 (16.8)

241 (14.9)

209 (16.1)

  5

415 (16.2)

101 (17.3)

314 (15.8)

151 (16.0)

264 (16.3)

208 (16.0)

6-7

513 (20.0)

120 (20.6)

393 (19.8)

187 (19.8)

326 (20.1)

261 (20.1)

Sex

  male

1311 (51.1)

309 (52.9)

1002 (50.5)

557 (58.9)

754 (46.5)

592 (45.6)

  female

1257 (49.0)

275 (47.1)

982 (49.5)

388 (41.1)

869 (53.5)

706 (54.4)

Family socioeconomic status at baseline

  low

667 (26.1)

169 (29.1)

498 (25.2)

296 (31.5)

371 (22.9)

292 (22.5)

  middle/high

1889 (73.9)

411 (70.9)

1478 (74.8)

643 (68.5)

1246 (77.1)

1003 (77.5)

Duration of breast-feeding in months

  < 4

481 (19.3)

135 (24.1)

346 (17.9)

192 (21.0)

289 (18.3)

221 (17.5)

  4 ≤ x < 8

670 (26.9)

159 (28.3)

511 (26.4)

250 (27.4)

420 (26.6)

333 (26.3)

  ≥ 8

1343 (53.9)

267 (47.6)

1076 (55.7)

471 (51.6)

872 (55.2)

711 (56.2)

SHS 0–3

  yes

299 (11.6)

66 (11.3)

233 (11.7)

105 (11.1)

194 (12.0)

153 (11.8)

  no

2269 (88.4)

518 (88.7)

1751 (88.3)

840 (88.9)

1429 (88.1)

1145 (88.2)

Mold 0–3

  yes

138 (5.4)

21 (3.6)

117 (5.9)

55 (5.8)

83 (5.1)

73 (5.6)

  no

2428 (94.6)

569 (96.4)

1867 (94.1)

888 (94.2)

1540 (94.9)

1225 (94.4)

SHS 0–13 *

  yes

468 (18.2)

121 (20.7)

347 (17.5)

161 (17.0)

307 (18.9)

234 (18.0)

  no

2100 (81.8)

463 (79.3)

1637 (82.5)

784 (83.0)

1316 (81.1)

1064 (82.0)

Mold 0–13 *

  yes

385 (15.0)

35 (6.0)

350 (17.6)

150 (15.9)

235 (14.5)

220 (17.0)

  no

2183 (85.0)

549 (94.0)

1634 (82.4)

795 (84.1)

1388 (85.5)

1078 (83.1)

Maternal smoking in pregnancy

  yes

364 (14.2)

104 (17.9)

260 (13.1)

160 (17.0)

204 (12.6)

156 (12.0)

  no

2199 (85.8)

477 (82.1)

1722 (86.9)

784 (83.1)

1415 (87.4)

1141 (88.0)

  1. Abbreviations: SHS0–3 = exposure to second-hand smoke at the age of 0–3, SHS0–13 = exposure to second-hand smoke at the age of 0–13.
  2. Missing information: 12 for family socioeconomic status at baseline, 74 for duration of breast-feeding, 5 for maternal smoking in pregnancy, 2 from mold-exposure from 0 to 3 years.
  3. *Used for adjustment when studying late-onset asthma as the outcome.