1. Context
2. Objectives
3. Methods
3.1. Data Sources
3.2. Study Selection
3.3. Risk of Bias Assessment
3.4.. Data Extraction
4. Results
| Ref. | Year | Country | No. of Patients in Botox Group | No. of Controls | Dose of Botox or Type of Control | Agea | Disease Durationa | Age at Onseta | Duration of Taking Botolinum | Muscular Weakness | Neck Pain | Blepharoptosis | Myalgia | Skin Tightness | Injection Pain | Headache | Musculo-Skeletal Pain | Nausea | Dizziness | Migraine | Facial Paralysis | Musculo-Skeletal Stiffness | Influenza-Like |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (11) | 30 | 42.2U | 14.9 (7.2) | 3 | 6 | 13 | 2 | ||||||||||||||||
| 2009 | USA | 30 | Topiramate | 20.0 (9.2) | |||||||||||||||||||
| (12) | 2010 | USA | 29 | 200U | 3 | 13 | |||||||||||||||||
| 30 | Topiramate | 6 | |||||||||||||||||||||
| (10) | 2020 | USA | 45 | 155U | 15.1 (1.4) | 4.1 (2.9) | 10.7 (3.0) | 3 | 3 | 1 | 3 | 1 | |||||||||||
| 43 | 74U | 15.0 (1.5) | 4.2 (2.7) | 10.4 (2.9) | 5 | 3 | 0 | 3 | |||||||||||||||
| 37 | Placebo | 15.2 (1.5) | 4.5 (3.4) | 10.3 (3.8) | 0 | 0 | 1 | 1 | |||||||||||||||
| (13) | 2009 | Germany | 31 | 210U | 42 (12) | 23 (14) | 3 | 8 | 2 | ||||||||||||||
| 29 | 80U | 49 (11) | 29 (13) | ||||||||||||||||||||
| 62 | Placebo | 47 (11) | 27 (12) | 1 | |||||||||||||||||||
| (14) | 1999 | USA | 42 | 25 U | 42.8 | 23.4 | 3 | 6 | 4 | ||||||||||||||
| 40 | 75 U | 42.4 | 16.9 | 7 | 5 | ||||||||||||||||||
| 41 | Placebo | 46.8 | 27.4 | 0 | 1 | ||||||||||||||||||
| (15) | 2014 | Brazil | 20 | 100U | 44.8 (12.6) | 3 | 6 | 2 | |||||||||||||||
| 18 | Placebo | 45.8 (14.2) | 2 | 1 | |||||||||||||||||||
| (16) | 2013 | China | 60 | 25U | 40.25 | 5.7 | 4 | 2 | 1 | ||||||||||||||
| (17) | 2016 | USA | 359 | 155U | 45.1 (13.2) | 12 | 3 | 3 | 5 | 5 | 1 | 4 | 3 | ||||||||||
| (18) | 2018 | USA | 716 | 155U | 43.0 (11.3) | 27 | 17 | 29 | 18 | 10 | 7 | 14 | 12 | 7 | 9 | ||||||||
| (19) | 2019 | USA | 641 | 155U | 43.1 | 12.8 | 32.3 | 27 | 10 | 28 | 17 | 6 | 14 | 10 | 3 | 6 | 7 | 17 | 3 | ||||
| (20) | 2019 | USA | 140 | 200U | 40.2 (11.7) | 8 | 10 | 1 | 6 | 6 | |||||||||||||
| 142 | Topiramate | 39.4 (12.6) | 3 | 19 | 18 | 2 | |||||||||||||||||
| (21) | 2004 | Germany | 20 | 100U | 37 (14) | 21 (14) | 3 | 3 | 2 | 2 | 0 | ||||||||||||
| 20 | 16U | 41 (9) | 23 (11) | 1 | 4 | 2 | 2 | ||||||||||||||||
| 20 | Placebo | 37 (9) | 22 (2) | 5 | 0 | 1 | 1 | ||||||||||||||||
| (22) | 2019 | USA | 30 | 185U | 16.5 (1.83) | 12-24 | 1 | ||||||||||||||||
| (23) | 2015 | Spain | 132 | 155-195U | 46.3 (12.3) | 10.5 (8.4) | 12 | 6 | 7 | ||||||||||||||
| (24) | 2019 | USA | 716 | 155U | 43.0 (11.3) | 27 | 10 | 29 | 18 | 7 | 14 | 12 | 7 | 9 | 17 | ||||||||
| (25) | 2018 | USA | 716 | 155U | 43.0 (11.3) | 10.6 (11.0) | 32.5 (13.7) | 27 | 10 | 29 | 18 | 7 | 14 | 12 | 7 | 9 | 17 | ||||||
| (22) | 2018 | India | 30 | 185U | 16.5 (1.8) | 3 | 1 | ||||||||||||||||
| (26) | 2014 | USA | 513 | 195U | 41.4 (10.2) | 19.6 (12.4) | 6 | 8 | 22 | 10 | 11 | ||||||||||||
| 492 | Placebo | 42.3 (10.7) | 19.3 (12.6) | ||||||||||||||||||||
| (27) | 2010 | USA | 688 | 155U | 41.1 | 6 | 38 | 46 | 28 | 18 | 22 | 20 | 15 | 16 | |||||||||
| 696 | Placebo | 41.5 | 2 | 15 | 2 | 2 | 14 | 11 | 5 | 5 | |||||||||||||
| (28) | 2010 | USA | 341 | 155U | 41.2 | 20.3 | 6 | 20 | 20 | ||||||||||||||
| 338 | Placebo | 42.5 | 20.6 | ||||||||||||||||||||
| (29) | 2016 | Greece | 81 | 155U | 43.5 (9.8) | 9 | 5 | 5 | 3 | ||||||||||||||
| (30) | 2004 | USA | 30 | 200U | 46.3 (9.4) | 6 | 1 | ||||||||||||||||
| 30 | Placebo | 47.7 (12.7) | |||||||||||||||||||||
| (31) | 2014 | Germany | 1384 | 163U | 42.1 (10.34) | 20.1 (12.55) | 21.0 (11.09) | 6 | 127 | 191 | 63 | 43 | 68 | 111 | 51 | 33 | 53 | 109 | 99 | 35 | |||
| 1052 | Placebo | 42.3 (10.89) | 19.8 (12.89) | 21.6 (11.79) | 3 | 25 | 5 | 3 | 28 | 58 | 29 | 17 | 25 | 1 | 14 | 31 | |||||||
| (32) | 2011 | Thailand | 43 | 120U | 38.9 (9.8) | 4.3 (4.7) | 3 | 2 | 0 | 0 | 1 | 2 | 1 | ||||||||||
| 43 | 240U | 38.1 (9.8) | 5.4 (6.3) | 0 | 2 | 0 | 0 | 1 | 0 | ||||||||||||||
| 41 | Placebo | 38.7 (10.2) | 4.7 (6.6) | 1 | 0 | 1 | 0 | 0 | 0 | ||||||||||||||
| (33) | 2016 | Egypt | 15 | 155-195U | 32.81 (7.64) | 5.12 (2.98) | 3 | 1 | 5 | ||||||||||||||
| 14 | RTMS | 31.98 (8.12) | 5.61 (3.20) | ||||||||||||||||||||
| (34) | 2017 | UK | 688 | 155U | 41.1 (10.4) | 19.4 (12.4) | 21.2 (11.0) | 6 | 38 | 46 | 23 | 18 | 22 | 20 | 15 | 16 | |||||||
| 696 | Placebo | 41.5 (10.7) | 19.0 (12.7) | 21.9 (11.9) | |||||||||||||||||||
| (35) | 2015 | Italy | 24 | NR | 6 | 7 | 4 | ||||||||||||||||
| (36) | 2014 | Taiwan | 8 | 75U | 47.6 (13.6) | 8.1 (8.3) | 3 | 2 | 0 | ||||||||||||||
| 59 | 100U | 3 | 3 | ||||||||||||||||||||
| 27 | 155U | 0 | 1 | ||||||||||||||||||||
| (37) | 2018 | USA | 716 | 155U | 43 (11.3) | 27 | 1 | 0 | 0 | 3 | 1 | ||||||||||||
| (18) | 2018 | USA | 715 | 155U | 43 (18-73) | 27 | 29 | 18 | 14 | 17 | |||||||||||||
| (38) | 2010 | Taiwan | 688 | 155U | 6 | 38 | 60 | ||||||||||||||||
| 696 | Placebo | ||||||||||||||||||||||
| (39) | 2008 | USA | 20 | 100U | 42.2 (19-64) | 4 | 1 | 0 | |||||||||||||||
| 21 | Placebo | 42.4 (25-55) | 1 | 1 | |||||||||||||||||||
| (40) | 2010 | Canada | 53* | 95-130 U | 46.5 (8.4) | 6 | 2 | 5 | |||||||||||||||
| (41) | 2014 | UK | 254 | 155U | 45.04 (19-91) | 1.4 (0.8-3) | 1 | 37 | 28 | 38 | 11 | ||||||||||||
| (42) | 2020 | Italy | 115 | 155U | 50 (44.5-54) | 5.2 (2-12) | 15 | 11 | 12 |
a Values are presened as mean.
| First Author and Year | Random Sequence Generation (Selection Bias) | Allocation Concealment (Selection Bias) | Blinding of Outcome Assessment (Detection Bias) | Incomplete Outcome Data (Attrition Bias) | Selective Reporting (Reporting Bias) | Other Potential Threats to Validity |
|---|---|---|---|---|---|---|
| Mathew (2009) (11) | LRB | LRB | URB | LRB | URB | LRB |
| Cady (2011) (12) | LRB | LRB | LRB | URB | LRB | LRB |
| Winner (2019) (24) | LRB | LRB | LRB | LRB | LRB | LRB |
| Petri (2009) (13) | LRB | LRB | LRB | LRB | LRB | LRB |
| Silberstein (2000) (14) | LRB | LRB | LRB | HRB | LRB | LRB |
| Hollanda (2014) (15) | LRB | LRB | HRB | URB | LRB | URB |
| Shao (2013) (16) | LRB | HRB | HRB | URB | LRB | HRB |
| Maasumi (2015) (17) | HRB | HRB | HRB | HRB | LRB | HRB |
| Blumenfeld (2019) (18) | HRB | HRB | HRB | LRB | LRB | URB |
| Young (2019) (19) | HRB | HRB | HRB | LRB | LRB | URB |
| Rothrock (2019) (20) | LRB | HRB | HRB | LRB | HRB | URB |
| Evers (2004) (21) | LRB | LRB | LRB | URB | URB | URB |
| Ali (2019) (22) | HRB | HRB | HRB | LRB | LRB | URB |
| Cernuda-Morollo´n (2015) (23) | HRB | HRB | HRB | LRB | LRB | HRB |
| Winner (2019) (24) | HRB | HRB | HRB | LRB | LRB | LRB |
| Blumenfeld (2018) (25) | HRB | HRB | HRB | URB | LRB | LRB |
| Ali (2019) (22) | HRB | HRB | HRB | URB | HRB | HRB |
| Aurora (2014) (26) | LRB | LRB | LRB | URB | LRB | LRB |
| Dodick (2010) (27) | LRB | LRB | LRB | LRB | LRB | LRB |
| Aurora (2010) (28) | LRB | LRB | LRB | LRB | LRB | LRB |
| Vikelis (2016) (29) | HRB | HRB | HRB | LRB | LRB | HRB |
| Ondo (2004) (30) | LRB | LRB | LRB | URB | LRB | URB |
| Diener (2014) (31) | LRB | LRB | LRB | LRB | LRB | LRB |
| Chankrachang (2011) (32) | LRB | LRB | LRB | LRB | LRB | LRB |
| Shehata (2016) (33) | LRB | HRB | HRB | URB | URB | HRB |
| Matharu (2017) (34) | LRB | LRB | LRB | LRB | LRB | LRB |
| Mazza (2015) (35) | URB | HRB | HRB | HRB | LRB | HRB |
| Lin (2014) (36) | HRB | HRB | HRB | URB | LRB | HRB |
| Brin (2018) (37) | HRB | HRB | HRB | HRB | LRB | HRB |
| Blumenfeld (2018) (18) | URB | HRB | HRB | URB | LRB | HRB |
| Chen (2010) (38) | LRB | LRB | LRB | URB | LRB | HRB |
| Freitag (2008) (39) | LRB | LRB | LRB | LRB | LRB | LRB |
| Christie (2010) (40) | HRB | HRB | HRB | LRB | LRB | URB |
| Khalil (2014) (41) | HRB | HRB | HRB | LRB | LRB | URB |
| Ornello (2020) (42) | HRB | HRB | HRB | LRB | LRB | LRB |
Abbreviations: LRB, Low risk of bias; HRB, High risk of bias; URB, Unclear risk of bias.





