2. Quality variables of neuromuscular monitoring methods among included trials.
| Study ID | Method of recording | Monitor site | Arm fixation | Supramaximal stimulation | Temperature maintained and recorded | Initial signal stabilization | Twich height calibration | Preload used |
| Adamus 2011 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Yes | Yes | Yes | Not mentioned | Yes | Not mentioned |
| Blobner 2010 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Yes | Yes | Yes | Not mentioned | Yes | Not mentioned |
| Brueckmann 2015 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Not mentioned | Not mentioned | Not mentioned | Yes | Not mentioned |
| Carron 2013 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Yes | Not mentioned | Not mentioned | Yes | Yes | No |
| Castro 2014 | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned |
| Cheong 2015 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Not mentioned | Yes | Not mentioned | Not mentioned | Not mentioned |
| Flockton 2008 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Yes | Yes | Yes | Yes | Not mentioned |
| Gaszynski 2011 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Yes | Yes | Yes | Not mentioned | Not mentioned | Not mentioned |
| Geldner 2012 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Not mentioned | Not mentioned | Yes | Yes | Not mentioned |
| Hakimoglu 2016 | Acceleromyography | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned |
| Illman 2011 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Yes | Yes | Yes | Yes | No | |
| Isik 2016 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Yes | Not mentioned | Yes | Not mentioned | Not mentioned | Not mentioned |
| Jones 2008 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Yes | Yes | Yes | Yes | Not mentioned |
| Kaufhold 2016 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Yes | Yes | Yes | Yes | Yes | Not mentioned |
| Khuenl‐Brady 2010 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Not mentioned | Yes | Yes | Yes | Not mentioned |
| Kizilay 2016 | Acceleromyography | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned |
| Koc 2015 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Not mentioned | Yes | Not mentioned | Yes | Not mentioned |
| Koyuncu 2015 | Acceleromyography | N. ulnaris, M. adductor pollicis |
No | Yes | No | No | Yes | Not mentioned |
| Lemmens 2010 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Yes | Yes | Yes | Yes | Not mentioned |
| Martini 2014 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Yes | Not mentioned | Yes | Yes | Yes |
| Mekawy 2012 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Not mentioned | Not mentioned | Not mentioned | Yes | Not mentioned |
| Pongracz 2013 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Yes | Yes | Yes | Yes | Yes | Yes |
| Sabo 2011 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned |
| Schaller 2010 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Yes | Yes | Yes | Yes | Yes | Not mentioned |
| Tas 2015 | Acceleromyography | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned |
| Woo 2013 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Yes * | No * | Yes * | Yes | Yes | No * |
| Wu 2014 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Yes | Not mentioned | Yes | Yes | Not mentioned |
| Yagan 2015 | Acceleromyography | N. ulnaris, M. adductor pollicis |
Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned | Not mentioned |
Studies with only abstracts were not included in this table because they did not document information regarding neuromuscular monitoring
List of abbreviations:
N. ulnaris ‐ ulnar nerve
M. adductor pollicis ‐ adductor pollicis muscle