Table 4 Missingness and summary statistics for risk factor records
Data element | Summary | Males N = 23,486 | Females N = 24,889 |
|---|---|---|---|
Smoking status | No. patients missing smoking record, n (%) | 4716 (20.1) | 5413 (21.7) |
Unique values, n | 4 | 4 | |
3 most frequent values in all records, n (%) | “Unknown”: 17,942 (33.8) “Never”: 16,760 (31.6) “Current”: 11,799 (22.2) | “Never”: 20,018 (38.6) “Unknown”: 18,812 (36.3) “Current”: 7658 (14.8) | |
Mean number of smoking records per patient, n (SD) | 2.8 (4.2) | 2.7 (3.6) | |
Median number of smoking records per patient, n (IQR) | 1.0 (2.0) | 1.0 (2.0) | |
Smoking start date | No. records missing start date, n (%) | 52,999 (99.9) | 51,780 (99.9) |
Smoking end date occurs before start date, n (%) | 0 (0) | 0 (0) | |
Alcohol use status | No. patients missing alcohol record, n (%) | 12,372 (52.7) | 15,034 (60.4) |
Unique values, n | 5 | 7 | |
3 most frequent values in all records, n (%) | ‘Current’: 7228 (93.6) ‘Past’: 479 (6.2) ‘Unknown’: 11 (0.1) | ‘Current’: 6068 (94.8) ‘Past’: 220 (3.4) ‘Unknown’: 108 (1.7) | |
Mean number of alcohol records per patient, n (SD) | 2.0 (2.2) | 2.2 (2.6) | |
Median number of alcohol records per patient, n | 1.0 (1.0) | 1.0 (1.0) | |
Alcohol use start date | No. records missing start date, n (%) | 21,939 (100) | 22,127 (100) |
Alcohol use end date occurs before start date, n (%) | 0 (0) | 0 (0) |