Table 1:
Baseline characteristics of analytical sample stratified by cancer status
| Characteristic | No cancer No. (%)a |
Prevalent cancer No. (%)a |
Incident cancer No. (%)a |
|---|---|---|---|
| Number | 110,419 | 12,635 | 17,905 |
| Median age (IQR) | 62.2 (59.0-65.6) | 63.4 (60.2-66.6) | 63.4 (60.4-66.5) |
| Age groups | |||
| 55-59 | 34,873 (31.6) | 2,959 (23.4) | 4,046 (22.6) |
| 60-64 | 43,566 (39.5) | 4,948 (39.2) | 7,220 (40.3) |
| 65-69 | 31,221 (28.3) | 4,591 (36.3) | 6,465 (36.1) |
| ≥ 70 | 759 (0.7) | 137 (1.1) | 174 (1.0) |
| Sex | |||
| Female | 59,941(54.3) | 8,299 (65.7) | 7,859 (43.9) |
| Male | 50,478(45.7) | 4,336 (34.3) | 10,046 (56.1) |
| Race | |||
| White | 106,516(96.6) | 12,356 (97.8) | 17,394 (96.9) |
| Black | 718 (0.7) | 69 (0.5) | 117 (0.7) |
| Asian | 2,021 (1.8) | 101 (0.8) | 219 (1.2) |
| Other | 1,021 (0.9) | 102 (0.8) | 152 (0.9) |
| Education | |||
| Higher | 38,723 (35.1) | 4,277 (33.9) | 5,932 (33.2) |
| Secondary | 35,883 (32.6) | 4,079 (32.3) | 5,570 (31.2) |
| Vocational | 8,018 (7.3) | 857 (6.8) | 1,428 (8.0) |
| Other | 27,610 (25.0) | 3,413 (27.0) | 4,944 (27.7) |
| BMI, mean (SD) | 27.6 (4.7) | 27.6 (4.8) | 29.0 (4.7) |
| Physical activity | |||
| Yes | 84,143(78.3) | 9,323 (76.1) | 13,500 (77.5) |
| No | 23,315 (21.7) | 2,934 (23.9) | 3,915 (22.5) |
| Ever smoked | |||
| Yes | 52,041 (47.4) | 6,451 (51.4) | 9,690 (54.5) |
| No | 57,757 (52.6) | 6,107 (48.6) | 8,102 (45.5) |
| Ever used alcohol | |||
| Yes | 104,978 (95.3) | 11,991 (95.0) | 17,154 (96.1) |
| No | 5,148 (4.7) | 625 (5.0) | 700 (3.9) |
| Townsend deprivation indexb | |||
| 1 (least deprived) | 23,221 (21.1) | 2,576 (20.4) | 3,681 (20.6) |
| 2-4 | 68,199 (61.8) | 7,756 (61.4) | 10,984 (61.4) |
| 5 (most deprived) | 18,859 (17.1) | 2,291 (18.2) | 3,226 (18.0) |
| Diabetes | |||
| Yes | 6,952 (6.3) | 843 (6.7) | 1,385 (7.7) |
| No | 103,467 (93.7) | 11,792 (93.3) | 16,520 (92.3) |
| Stroke | |||
| Yes | 2,191 (2.0) | 301 (2.4) | 422 (2.4) |
| No | 108,228 (98.0) | 12,334 (97.6) | 17,483 (97.6) |
| Median number of clinic visitsc (25th-75th percentile) | 6 (2-11) | 8 (4-15) | 6 (2-12) |
| Median follow-up time (25th-75th percentile) | 12.3 (11.6-13.1) | 12.2 (11.3-13.0) | 4.9 (2.2-8.2) |
Abbreviations: BMI, body mass index (calculated as weight in kilograms divided by height in meters squared); SD, standard deviation.
a
Percentages may not sum to 100 due to rounding.
b
Index quintiles, combining social class, employment, car availability, and housing.
c
Number of primary care clinics visits in the year before study entry.