Table 2.
Baseline characteristics in cases (all gastrointestinal cancers) and all matched controls by database (QResearch or CPRD). Values are percentages and numbers unless stated otherwise
| QResearch | CPRD | ||||
|---|---|---|---|---|---|
| Cases (n=28 625) | Controls (n=133 770) | Cases (n=27 324) | Controls (n=127 850) | ||
| Body mass index (BMI): | |||||
| 15-24* | 35.0 (7729) | 36.2 (35 826) | 36.4 (8242) | 37.7 (39 188) | |
| 25-29* | 42.0 (9290) | 42.1 (41 650) | 41.4 (9363) | 41.6 (43 319) | |
| 30-49* | 23.0 (5088) | 21.7 (21 424) | 22.2 (5029) | 20.7 (21 535) | |
| Not recorded | 22.8 (6518) | 26.1 (34 870) | 17.2 (4690) | 18.6 (23 808) | |
| Years since recorded† | 2.6 (1.5-5.6) | 2.7 (1.5-5.9) | 2.6 (1.5-5.9) | 2.8 (1.5-6.2) | |
| Smoking status: | |||||
| Non-smoker* | 43.1 (11230) | 47.3 (55 708) | 50.1 (12 904) | 54.4 (63 608) | |
| Ex-smoker* | 39.4 (10 268) | 37.2 (43 894) | 33.5 (8621) | 30.8 (35 979) | |
| Current light* | 6.1 (1591) | 5.5 (6485) | 3.8 (985) | 3.6 (4200) | |
| Current moderate* | 7.5 (1958) | 6.7 (7870) | 8.7 (2233) | 7.9 (9217) | |
| Current heavy* | 3.9 (1010) | 3.3 (3919) | 3.9 (997) | 3.4 (3927) | |
| Not recorded | 9.0 (2568) | 11.9 (15 894) | 5.8 (1584) | 8.5 (10 919) | |
| Years since recorded† | 0.9 (0.3-3.0) | 1.1 (0.4-3.6) | 1.0 (0.3-3.2) | 1.2 (0.4-3.8) | |
| Use of alcohol: | |||||
| No use* | 30.5 (6925) | 30.8 (31 788) | 26.4 (6114) | 27.0 (28 540) | |
| Ex-user* | — | — | 2.6 (601) | 2.4 (2489) | |
| Light* | 57.8 (13140) | 59.8 (61 764) | 55.7 (12 924) | 57.3 (60 633) | |
| Moderate and more* | 11.7 (2653) | 9.4 (9731) | 15.4 (3564) | 13.4 (14 192) | |
| Not recorded | 20.6 (5907) | 22.8 (30 487) | 15.1 (4121) | 17.2 (21 996) | |
| Years since recorded† | 2.1 (0.6-5.5) | 2.4 (0.7-6.0) | 3.0 (0.9-7.0) | 3.3 (1.0-7.4) | |
*Proportion only within recorded data.
‡Median (interquartile range) time in years between recorded value and index date.