Table 3: Population demographics.

MildModerate–severeStudy population

Mean age (years)68.169.669.0
SD 9.4SD 9.7SD 9.6
 40–65 years ()12 (34%)13 (25%)25 (29%)
 65+ years ()23 (66%)39 (75%)62 (71%)
Gender
 Female ()13 (37%)23 (44%)36 (42%)
 Male ()22 (63%)29 (56%)51 (58%)
Mini mental state examination (mean)28.726.727.5
SD 1.9SD 4.0SD 3.4
Disease duration (years)2.78.26.0
SD 3.1SD 5.4SD 5.3
Disease severity (HY stage) 35 (40.2%)52 (59.8%)87 (100%)
 Stage 122 (25.3%)022 (25.3%)
 Stage 1.52 (2.3%)02 (2.3%)
 Stage 211 (12.6%)011 (12.6%)
 Stage 2.5026 (29.9%)26 (29.9%)
 Stage 3016 (18.4%)16 (18.4%)
 Stage 4010 (11.5%)10 (11.5%)