| Characteristic | Category | Dispensed ≥10 drugs,n = 1444, n (%) | OR univariable(95% CI)b,c | OR multivariable(95% CI)c,d |
|---|---|---|---|---|
| Age group, years | 60–64 | 19 (21.8) | Ref | Ref |
| 65–69 | 53 (34.4) | 1.76 (0.94 to 3.29) | 1.80 (0.96 to 3.38) | |
| 70–74 | 101 (35.4) | 1.79 (1.00 to 3.21) | 1.86 (1.04 to 3.34) | |
| 75–79 | 163 (34.0) | 1.67 (0.96 to 2.94) | 1.73 (0.98 to 3.03) | |
| 80–84 | 302 (34.2) | 1.65 (0.96 to 2.85) | 1.75 (1.01 to 3.02) | |
| 85–89 | 393 (33.9) | 1.60 (0.93 to 2.75) | 1.66 (0.97 to 2.87) | |
| 90–94 | 288 (28.9) | 1.18 (0.68 to 2.04) | 1.19 (0.69 to 2.07) | |
| ≥95 | 125 (29.4) | 1.14 (0.64 to 2.01) | 1.08 (0.61 to 1.92) | |
| Sex | Male | 422 (33.2) | Ref | – |
| Female | 1022 (32.0) | 0.89 (0.77 to 1.03) | – | |
| Dementia status | No dementia | 802 (34.7) | Ref | Ref |
| Dementia | 642 (29.7) | 0.78 (0.68 to 0.89) | 0.73 (0.64 to 0.84) | |
| Care home type | Nursing | 743 (28.6) | Ref | Ref |
| Residential | 701 (37.5) | 1.49 (1.19 to 1.85) | 1.50 (1.19 to 1.88) | |
| RAD score | Low | 1045 (34.4) | Ref | Ref |
| Medium | 175 (29.4) | 0.75 (0.54 to 1.06) | 0.72 (0.52 to 0.99) | |
| High | 224 (26.9) | 0.69 (0.51 to 0.93) | 0.77 (0.56 to 1.04) | |
| NHS health board | Tayside | 805 (30.1) | Ref | Ref |
| Fife | 639 (35.7) | 1.24 (0.99 to 1.57) | 1.37 (1.09 to 1.71) | |
| Intraclass correlation coefficient, % (95% CI) | — | — | 8.9 (5.9 to 11.6)Null model | 7.1 (4.2 to 9.5)Adjusted model |
aWithin category %. bNumber of groups = 147; residents in all models = 4468. Service sector and care home size not fitted in models as collinear with care home status. cUnless otherwise stated. dC-statistic = 0.685. – = variable not fitted. RAD = Risk Assessment Document.