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Table 5 Prevalence and odds ratios for repeat prescribing, standardised by age, gender and number of physical conditions

From: Co-morbidity and polypharmacy in Parkinson’s disease: insights from a large Scottish primary care database

Number of active repeat medicationsa Parkinson’s N (prevalence %) N = 2640 No Parkinson’s N (prevalence %) N = 507,862 Odds ratio (95% CI) Directly standardised for age, sex, and number of physical conditionsb
None 191 (7.2) 148,615 (29.3) 0.38 (0.32 to 0.45)
One 122 (4.6) 56,729 (11.2) 0.61 (0.51 to 0.73)
Two 167 (6.3) 53,903 (10.6) 0.71 (0.60 to 0.83)
Three 230 (8.7) 48,760 (9.6) 0.91 (0.80 to 1.05) p = 0.23
Four 252 (9.6) 44,000 (8.7) 0.95 (0.83 to 1.08) p = 0.46
Five to nine 1172 (44.5) 124,619 (24.5) 1.40 (1.28 to 1.53)
Ten or more 506 (19.2) 31,236 (6.2) 1.90 (1.68 to 2.15)
  1. aAuthorised for repeat issue without a consultation and issued in the last 84 days
  2. bAll differences significant at p < 0.001 except where stated