| | Study (year) | Subject (N) | Age (mean (SD)) | Sex M/F | HY | PD duration (years) | Intervention | Intervention/control | Outcomes |
| | L O ramig 2001a | I = 21 | I = 61.3 (11.4) | I = 17/4 | I = 2.6 (0.6) | I = 7.2 (5.4) | I = LSVT | I = 1 h/time, 4 times/week, for 4 weeks | SPL, STSD | | C = 12 | C = 63.3 (7.1) | C = 7/5 | C = 2.2 (0.9) | C = 5.0 (4.6) | C = RET | C = 1 h/time, 4 times/week, for 4 weeks |
| | L O ramig 2001b | I = 14 | I = 67.9 (9.0) | I = 7/07 | — | I = 8.6 (6.3) | I = LSVT | I = 1 h/time, 4 times/week, for 4 weeks | SPL | | C = 14 | C = 69.8 (6.8) | C = 7/07 | — | — | C = NO | — |
| | LO ramig 1995 | I = 26 | I = 63.5 (11.5) | I = 21/05 | I = 2.7 (0.7) | I = 8.3 (9.3) | I = LSVT | I = 4 times/week, for 4 weeks | SPL, STSD | | C = 19 | C = 65.6 (8.9) | C = 12/07 | C = 2.3 (0.8) | C = 5.9 (4.7) | C = RET | C = 4 times/week, for 4 weeks | Max duration |
| | LO ramig 2018 | I = 22 | I = 64 (9) | I = 14/8 | I = 2 (0.5) | I = 5 (4) | I = LSVT | I = 1 h/day, 4 days/week, for 4 weeks | SPL | | C = 20 | C = 64 (9) | C = 13/7 | — | — | C = NO | C = 45 min/day, once/week, for 6–8 weeks |
| | Arezzoo saffarian 2019 | I = 13 | I = 56.6 (4.70) | I = 7/6 | I = 1.46 (0.49) | — | I = LSVT | I = 1 h/time, 4 days/week, for 4 weeks | VHI | | C = 13 | C = 57.8 (3.46) | C = 5/5 | C = 1.20 (0.34) | — | C = NO | |
| | LO ramig 1996 | I = 22 | I = 63.23 (11.87) | — | I = 2.63 (0.6) | I = 6.55 (5.25) | I = LSVT | I = 16 times/month | SPL | | C = 13 | C = 65.31 (8.89) | — | C = 2.25 (0.86) | C = 4.77 (3.06) | C = RET | C = 16 times/month |
| | Qi wu 2020 | I = 50 | I = 48.76 (7.21) | I = 22/28 | — | I = 9.02 (3.71) | I = LSVT + Conventional | I = 30–40/times, 2 times/day, 5 weeks + 0–40 min/time, 3 times/day, 3 weeks | VHI, UPDRS-III, speech intelligibility | | C = 50 | C = 48.76 (7.21) | C = 20/20 | — | C = 9.68 (4.11) | C = Conventional | C = 30–40 min/time, 3 times/day, 3 weeks |
| | Haiyu tang 2016 | I = 32 | I = 69.75 (4.35) | I = 17/19 | I = 2.02 (0.54) | I = 4.52 (3.26) | I = LSVT + Conventional | I = 40–60 min/time, 4 times/weeks, 12 weeks + 1 h/time, 4 times/week, 12 week | VHI, WAB, speech intelligibility | | C = 32 | C = 68.45 (4.62) | C = 15/13 | C = 2.05 (0.48) | C = 4.46 (3.43) | C = Conventional | C = 40–60 min/time, 4 times/week, 12 weeks |
| | Meifang yang 2017 | I = 49 | I = 66.83 (2.89) | I = 27/22 | I = 2.11 (0.27) | I = 5.12 (0.67) | I = LSVT | I = 1 h/time, 4 times/week, 12 weeks | VHI, WAB | | C = 49 | C = 65.82 (2.56) | C = 25/24 | C = 2.09(0.34) | C = 5.52(0.16) | C = Conventional | C = 1 h/time, 4 times/week, 12 week | Speech intelligibility |
| | Geralyn schulz 2021 | I = 20 | I = 67 | I = 15/15 | I = 2.13 | I = 4.89 | I = LSVT | — | SPL | | C = 18 | C = 63.5 | C = 11/07 | C = 2.14 | C = 4.64 | C = NO | — |
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