| Characteristic | Category | Dispensed 0–9 drugs,n = 3024, n (%)a | Dispensed ≥10 drugs,n = 1444, n (%)a | All residents,n = 4468, n (%)a |
|---|---|---|---|---|
| Sex | Male | 850 (28.1) | 422 (29.2) | 1272 (28.5) |
| Female | 2174 (71.9) | 1022 (70.8) | 3196 (71.5) | |
| Age, years | Mean (SD) | 85.1 (8.3) | 84.6 (7.9) | 84.9 (8.1) |
| Age group, years | 60–64 | 68 (2.2) | 19 (1.3) | 87 (1.9) |
| 65–69 | 101 (3.3) | 53 (3.7) | 154 (3.4) | |
| 70–74 | 184 (6.1) | 101 (7.0) | 285 (6.4) | |
| 75–79 | 317 (10.5) | 163 (11.3) | 480 (10.7) | |
| 80–84 | 580 (19.2) | 302 (20.9) | 882 (19.7) | |
| 85–89 | 765 (25.3) | 393 (27.2) | 1158 (25.9) | |
| 90–94 | 709 (23.4) | 288 (19.9) | 997 (22.3) | |
| ≥95 | 300 (9.9) | 125 (8.7) | 425 (9.5) | |
| Drugs prescribedb | Mean (SD) | — | — | 7.8 (4.3) |
| Median (IQR) | — | — | 8 (3–13) | |
| Number of BNF chapters drugs prescribed from | Mean (SD) | 3.4 (1.5) | 6.1 (1.3) | 4.2 (1.9) |
| Dementia diagnosis | No dementia | 1506 (49.8) | 802 (55.5) | 2308 (51.7) |
| Dementia | 1518 (50.2) | 642 (44.5) | 2160 (48.3) | |
| Care home type | Nursing care (n = 71 homes) | 1858 (61.4) | 743 (51.5) | 2601 (58.2) |
| Residential care (n = 76 homes) | 1166 (38.6) | 701 (48.5) | 1867 (41.8) | |
| Service sector | Private (n = 117) | 2625 (86.8) | 1124 (77.8) | 3749 (83.9) |
| Local Authority (n = 19) | 246 (8.1) | 205 (14.2) | 451 (10.1) | |
| Third sector (n = 11) | 153 (5.1) | 115 (8.0) | 268 (6.0) | |
| Care home sizec | Small (n = 41) | 417 (13.8) | 220 (15.2) | 637 (14.3) |
| Medium (n = 68) | 1314 (43.5) | 714 (49.4) | 2028 (45.4) | |
| Large (n = 37) | 1290 (42.7) | 510 (35.3) | 1800 (40.3) | |
| RAD score | Low (n = 102) | 1994 (65.9) | 1045 (72.4) | 3039 (68.0) |
| Medium (n = 19) | 421 (13.9) | 175 (12.1) | 596 (13.3) | |
| High (n = 26) | 609 (20.1) | 224 (15.5) | 833 (18.6) | |
| Health board | Tayside (n = 90) | 1871 (61.9) | 805 (55.7) | 2676 (59.9) |
| Fife (n = 57) | 1153 (38.1) | 639 (44.3) | 1792 (40.1) |
aUnless otherwise stated. bDistribution normal overall but skewed in groups so SD and IRQ not reported for groups. Overall distribution shown in Supplementary Figure S1. cMissing data for one care home. BNF = British National Formulary. IQR = interquartile range. RAD = Risk Assessment Document. SD = standard deviation.