Table 1 Characteristics of study participants
Characteristic | PD cases n = 352 | Controls n = 352 |
|---|---|---|
Age at recruitment, yearsa | 60.8 (54.8–65.7) | 60.4 (55.0–65.2) |
Age at PD diagnosis, years | 68.7 (62.8–74.0) | – |
Years between recruitment and PD diagnosis | 7.8 (4.6–11.0) | – |
Sex, n (%)a | ||
Male | 195 (55%) | 195 (55%) |
Female | 157 (45%) | 157 (45%) |
Country, n (%)a | ||
Italy | 54 (15%) | 54 (15%) |
Spain | 97 (28%) | 97 (28%) |
UK | 142 (40%) | 142 (40%) |
Netherlands | 13 (4%) | 13 (4%) |
Germany | 46 (13%) | 46 (13%) |
Smoking status at recruitment, n (%) | ||
Never smokers | 183 (52%) | 174 (49%) |
Former smokers | 116 (33%) | 110 (31%) |
Current smokers | 43 (12%) | 55 (16%) |
Unknown | 10 (3%) | 13 (4%) |
BMI categories, n (%) | ||
BMI < 25 kg/m2 | 119 (34%) | 137 (39%) |
BMI ≥ 25 | 233 (66%) | 215 (61%) |