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Table 1 Comparison of the demographic and clinical characteristics of cases with PD and secondary parkinsonism

From: Clinical profile of parkinsonism and Parkinson's disease in Lagos, Southwestern Nigeria

Characteristic Parkinson's disease
n = 98
Secondary parkinsonism
n = 26
Statistical comparison
Frequency (%) 98/124 (79.0%) 26/124 (21.0%)  
Male (%) 75 (76.5%) 19 (73.1%) RR = 1.04 (95% CI 0.83-1.30)
Female (%) 23 (23.5%) 7 (26.9%)  
Male to female ratio 3.3 to 1 2.7 to 1  
Mean age (SD) at onset, years 61.5 (10.0) 57.5 (14.0) T = 1.66; P = 0.10
Median age at onset 63 61.5  
Age range at onset 37 to 77 22 to 78  
Family history of PD in FDR 1 (1.02%) 0 (0%) RR = 1.27 (95% CI 1.16-1.39)
  1. FDR First degree relative
  2. RR Relative risk
  3. CI 95% Confidence Interval