Table 3.
Frequency distribution of SCAs studied by various groups in India (n = total number of cases studied; * Studies in which patients were screened only for a particular SCA subtype.)
| Reported publications | Region | n | SCA1 | SCA2 | SCA3 | SCA6 | SCA7 | SCA12 | SCA17 | DRPLA | FRDA | UC‐SCA |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Current study | India | 5594 | 272 | 482 | 113 | 5 | 28 | 490 | 5 | – | 127 | 4147 |
| Bhanushali et al., 2020[ 71 ] | 700 | 30 | 101 | 32 | 2 | – | 229 | – | – | – | ||
| Venkatesh et al., 2018[ 72 ] | Bangalore (South) | 864 | 100 | 98 | 40 | – | – | 8 | – | – | 20 | 598 |
| Pulai et al., 2014 [ 13 ] | Kolkata (East) | 83 | 13 | 18 | 7 | 6 | – | 1 | – | – | – | 38 |
| Netravathi et al., 2009[ 73 ] | Bangalore (South) | 24 | 6 | 5 | 3 | – | – | – | – | – | – | |
| Faruq et al., 2009[ 77 ] | Delhi (North) | 400 | 27 | 60 | 14 | – | 3 | 45 | – | – | 17 | 234 |
| Krishna et al., 2007[ 17 ] | Bangalore (South) | 284 | 39 | 32 | 18 | – | – | – | – | – | – | 202 |
| Alluri et al., 2007[ 74 ] | Hyderabad (South) | 124 | 6 | 1 | 1 | – | 1 | – | – | 1 | – | 114 |
| Rengaraj et al., 2005[ 16 ] | Chennai (South) | 17 | 17 | – | – | – | – | – | – | – | – | |
| Sinha et al., 2004[ 9 ] | Madhya Pradesh, Bihar, West Bengal | 44 | 7 | 26 | – | – | – | – | – | – | – | |
| Wadia et al., 1998[ 87 ]; | Mumbai (South‐Western) | 6/31 | – | 6 | – | – | – | – | ‐ | – | – | |
| Basu et al., 2000[ 46 ]; Chattopadhyay et al., 2003[ 44 ]; Sinha et al., 2004[ 9 ]; Chakravarty and Mukherjee, 2002[ 14 ] | Kolkata (East) | 99 | 12 | 30 | 12 | 1 | – | – | – | – | 6 | 47 |
| Srivastava et al., 2001[ 75 ] | Delhi (North) | 77 (families) | 12 | 19 | 2 | – | 2 | 5 | – | – | – | |
| Hire et al., 2011*[ 76 ] | Southern India | 481 | – | – | – | – | – | – | 2 | – | – | |
| Sharma et al., 2012[ 78 ] | Gwalior, MP (central part of India) | 24 | 5 | – | – | – | – | – | – | – | – | |
| Wali et al., 2013*[ 79 ] | Belgaum region of Northern Karnataka, Southern India | 9 | – | – | – | – | 6 | – | – | – | – | |
| Faruq et al., 2014[ 54 ] | 2 | – | 2 | – | – | – | 2 | – | – | – | ||
| Singh et al., 2014*[ 80 ] | Lucknow, UP | 1 | – | 1 | – | – | – | – | – | – | – | |
| Kumaran et al., 2014*[ 81 ] | Adukkamparai village in Vellore, India | 100 | 37 | – | – | – | – | – | – | – | – | |
| Faruq et al., 2015[ 50 ] | Haryana (a state in Northern India) | 35 | – | – | – | – | 22 | – | – | – | – | |
| Lone et al., 2016*[ 82 ] | Hyderabad, Telangana (Southern India) | 188 | – | – | – | – | – | 1 | – | – | – | |
| Singh et al., 2017*[ 83 ] | Lucknow, Uttar Pradesh (Northern India) | 1 | – | 1 | – | – | – | – | – | – | – | |
| Kasinathan et al., 2017*[ 84 ] | PGMIR, Chandigarh (North India) | 1 | – | 1 | – | – | – | – | – | – | – | |
| Anjanappa et al., 2019*[ 85 ] | Bangalore | 38 | – | – | 18 | – | – | – | – | – | – | |
| Goel et al., 2019[ 86 ] | 461 | – | – | – | – | – | – | – | – | – |