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Table 1 Baseline characteristics of Gedling study participants included in cross-sectional and longitudinal traffic pollution analyses and those lost to follow-up

From: Effect of traffic pollution on respiratory and allergic disease in adults: cross-sectional and longitudinal analyses

Baseline characteristics

Cross-sectional analysis

(N = 2599) Number (%)

Longitudinal analysis

(N = 1329) Number (%)

Lost to follow-up

(N = 1267) Number (%)

Age group

   

18–29

415 (16.0)

134 (10.1)

281 (22.2)

30–39

553 (21.3)

263 (19.8)

290 (22.9)

40–49

664 (25.6)

369 (27.8)

295 (23.3)

50–59

523 (20.1)

341 (25.7)

181 (14.3)

60–70

444 (17.1)

222 (16.7)

220 (17.4)

Sex

   

Men

1299 (50.0)

659 (49.6)

639 (50.4)

Women

1300 (50.0)

670 (50.4)

628 (49.6)

Carstairs deprivation quintiles

   

1st (least deprived)

636 (24.5)

292 (22.0)

282 (22.3)

2nd

457 (17.6)

255 (19.2)

202 (15.9)

3rd

523 (20.1)

307 (23.1)

241 (19.0)

4th

482 (18.6)

220 (16.6)

264 (20.8)

5th (most deprived)

501 (19.3)

255 (19.2)

278 (21.9)

Smoking status

   

Never

1289 (49.6)

705 (53.1)

583 (46.0)

Ex-smoker

722 (27.8)

387 (29.1)

334 (26.4)

Current smoker

588 (22.6)

237 (17.8)

350 (27.6)

Distance to a main road

   

<50 m

164 (6.3)

87 (6.6)

77 (6.1)

50 – 100 m

226 (8.7)

112 (8.4)

114 (9.0)

100 – 150 m

190 (7.3)

96 (7.2)

94 (7.4)

> 150 m

2019 (77.7)

1034 (77.8)

982 (77.5)

Modelled quintiles of NO 2 (μg/m 3 )

   

<33.92

520 (20.0)

267 (20.1)

252 (19.9)

33.92 – 34.23

520 (20.0)

279 (21.0)

240 (18.9)

34.23 – 34.73

520 (20.0)

277 (20.8)

242 (19.1)

34.73 – 36.79

520 (20.0)

248 (18.7)

272 (21.5)

>36.79

519 (20.0)

258 (19.4)

261 (20.6)

Outcomes*

   

Current wheeze

624 (24.0)

274 (20.6)

347 (27.4)

Diagnosed asthma

231 (8.9)

102 (7.7)

128 (10.1)

COPD**

238 (9.2)

102 (7.7)

135 (10.7)

BHR

310 (13.0)

147 (11.7)

163 (12.9)

Ever hay fever

662 (25.5)

323 (24.3)

337 (26.6)

Ever eczema

714 (27.5)

365 (27.5)

348 (27.5)

Allergen skin sensitisation

788 (30.3)

406 (30.6)

381 (30.1)

High total IgE

549 (22.3)

258 (20.2)

290 (22.9)

  1. NO2 nitrogen dioxide; COPD chronic obstructive pulmonary disease; BHR bronchial hyper-responsiveness; IgE immunoglobulin E.
  2. * For outcomes, values represent number and % positive where %'s are computed excluding any missing values
  3. **COPD: 7 missing values in cross-sectional study (% = 238/2592) and 1 in longitudinal (% = 102/1328)
  4. BHR: 216 missing values in cross-sectional study (% = 310/2383) and 74 in longitudinal (% = 147/1255)
  5. IgE: 132 missing values in cross-sectional study (% = 549/2467) and 53 in longitudinal (% = 258/1276)