Table 1.
Characteristics of cases with Parkinson or Parkinson‐like symptoms and their matched controls
| Idiopathic Parkinson’s disease | Parkinson’s disease‐like symptoms | |||||
|---|---|---|---|---|---|---|
| Cases (n = 3976) | Controls (n = 15 891) | OR (95% CI) | Cases (n = 18 336) | Controls (n = 73 320) | OR (95% CI) | |
| Age <50 | 76 (1·9) | 305 (1·9) | – | 4945 (27·0) | 19 787 (27·0) | – |
| 50–69 | 1236 (31·1) | 4944 (31·1) | – | 6115 (33·3) | 24 462 (33·3) | – |
| 70+ | 2664 (67·0) | 10 642 (67·0) | – | 7276 (39·7) | 29 071 (39·7) | – |
| Men | 2327 (58·5) | 9299 (58·5) | – | 7693 (42·0) | 30 766 (42·0) | – |
| Women | 1649 (41·5) | 6592 (41·5) | – | 10 643 (58·0) | 42 554 (58·0) | – |
| Non‐smoker | 2402 (60·4) | 8076 (50·8) | 1·0 | 9174 (50·0) | 37 997 (51·8) | 1·0 |
| Current smoker | 342 (8·6) | 2261 (14·2) | 0·50 (0·44–0·56) | 3886 (21·2) | 12 886 (17·6) | 1·26 (1·21–1·32) |
| Ex‐smoker | 690 (17·4) | 3192 (20·1) | 0·71 (0·64–0·78) | 3258 (17·8) | 12 418 (16·9) | 1·10 (1·05–1·16) |
| Unknown | 542 (13·6) | 2362 (14·9) | 0·75 (0·67–0·84) | 2018 (11·0) | 10 019 (13·7) | 0·77 (0·72–0·81) |
| BMI <25 kg/m2 | 1189 (29·9) | 4339 (27·3) | 1·0 | 6167 (33·6) | 22 837 (31·2) | 1·0 |
| 25–29·9 | 1322 (33·2) | 5241 (33·0) | 0·92 (0·84–1·01) | 5577 (30·4) | 22 039 (30·0) | 0·94 (0·90–0·98) |
| 30–59·9 | 516 (13·0) | 2290 (14·4) | 0·82 (0·73–0·92) | 2969 (16·2) | 11 720 (16·0) | 0·94 (0·89–0·99) |
| Unknown | 949 (23·9) | 4021 (25·3) | 0·85 (0·76–0·94) | 3623 (19·8) | 16 724 (22·8) | 0·77 (0·73–0·81) |