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

BMC Neurology

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

Number of active repeat medications^a	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 conditions^b
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)

^aAuthorised for repeat issue without a consultation and issued in the last 84 days
^bAll differences significant at p < 0.001 except where stated

ISSN: 1471-2377