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Table 2 Prevalence and odds ratio for number and type of comorbidities (standardised by age, gender and deprivation score)

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

  Parkinson’s N (prevalence %) N = 2640 (0.5%) No Parkinson’s N (prevalence %) N = 507,862 (99.5%) Odds ratio (95% CI) (standardised by age, gender and deprivation)b
Total number of morbiditiesa
 None 195 (7.4) 116,358 (22.9) 0.43 (0.38–0.49)
 One 376 (14.3) 113,634 (22.4) 0.81 (0.73–0.89)
 Two 487 (18.5) 94,062 (18.5) 0.99 (0.90–1.09)
 Three 430 (16.3) 69,525 (13.7) 1.01 (0.91–1.12)
 Four 355 (12.7) 47,109 (9.3) 1.05 (0.94–1.19)
 Five 291 (11.0) 29,601 (5.8) 1.38 (1.22–1.56)
 Six 208 (7.8) 17,800 (3.5) 1.56 (1.35–1.81)
 Seven or more 318 (12.0) 19,773 (3.9) 2.08 (1.84–2.35)
Total number of physical conditionsa
 None 311 (11.8) 129,846 (25.6) 0.65 (0.58–0.74)
 One 509 (19.3) 123,984 (24.4) 0.90 (0.82–1.00)
 Two 558 (21.1) 99,187 (19.5) 1.03 (0.94–1.13)
 Three 444 (16.8) 67,710 (13.3) 1.02 (0.92–1.14)
 Four 327 (12.4) 41,539 (8.1) 1.10 (0.98–1.23)
 Five 233 (8.8) 23,414 (4.6) 1.30 (1.13–1.47)
 Six 121 (4.5) 12,078 (2.4) 1.19 (1.01–1.37)
 Seven or more 137 (5.2) 10,104 (2.0) 1.52 (1.27–1.86)
Total number of mental health conditions
 None 1477 (56.0) 406,379 (80.0) 0.33 (0.30–0.36)
 One 718 (27.2) 74,234 (14.6) 2.09 (1.92–2.27)
 Two 376 (14.2) 23,583 (4.6) 3.08 (2.75–3.45)
 Three or more 69 (2.6) 3666 (0.7) 3.14 (2.46–4.00)
  1. aExcluding PD. Includes all other physical + mental conditions
  2. bAll differences significant at p < 0.001