[RESULTS] There was a better improvement in patients who underwent hydrotherapy than in patients treated with land-based therapy in the centre of pressure sway area closed eyes ( mean SD change : 45.4 SD64 .9 vs. 6.9 SD45 .3 , p = 0.05 ) , Berg Balance Scale ( 51.2 SD3 .1 vs. 6.0 SD3 .1 , p = 0.005 ) , Activities-specific Balance Confidence Scale ( 16.8 SD10 .6 vs. 4.1 SD5 .4 , p = 0.0001 ) , Falls Efficacy Scale ( -5.9 SD4 .8 vs. -1.9 SD1 .4 , p = 0.003 ) , Parkinson 's Disease Quetionnaire-39 ( -18.4 SD12 .9 vs. -8.0 SD7 .0 , p = 0.006 ) and falls diary ( -2.4 SD2 .2 vs. -0.4 SD0 .5 , p = 0.001 ) .