TABLE 2.
Extracted variables from included studies
| Category | Variable | Description of what was assessed |
|---|---|---|
| General study information | First author, year, journal | First author, year, journal |
| Study type | For example, cross‐sectional, case‐control | |
| Population | Adults/children | |
| Recording hardware | Description of EMG device | Authors’ description of type of EMG device |
| Commercial name of EMG device | Commercial name, description and/or manufacturer of EMG device | |
| Electrode type | Description of electrode | |
| Wireless electrode | Yes/no | |
| Number of channels | Number and site of channels | |
| Muscles | Which masticatory muscles were used for signal acquisition | |
| Picture of device | Present in publication; yes/no | |
| Use of additional instrumental methods to assess bruxism | For example, electrocardiographic activity, audiovisual recordings | |
| Recording logistics | Number of recording nights (not including the adaptation night) | Total number and, if applicable, number of recording sets (eg within 3 weeks, 3 sets of 4 recording nights) |
| Adaptation night before scoring | Yes/no | |
| Setting | Home/sleep laboratory | |
| Participant instructions device and electrode handling | How were participants instructed on using the device and handling the electrode | |
| Participant instructions device set‐up | If applicable, how were participants instructed to set‐up the device (eg performing MVC) | |
| Electrode placement | By participant of investigator | |
| How are failures dealt with | Which action followed if acquisition of the recording failed | |
| Signal acquisition | Amplification factor | How many times was the signal amplified |
| Impedance measurement | What data are provided on amplifier input and/or skin impedance | |
| Bandpass settings | What was the frequency range of the signal acquisition | |
| Notch filter | Frequency of additional notch filter | |
| A/D resolution | What was the resolution of the A/D converter | |
| Sampling rate | At which frequency was the signal sampled | |
| Signal analysis | Device output | Raw EMG signal/scored activity (viz. activity which was scored after automatic analysis of the EMG signal inside the EMG device) |
| Definition of analysis time | Which part of the signal was analysed | |
| EMG scoring software | Commercial name | |
| Rectification | Was the signal rectified | |
| Processing | Was the signal further processed, if yes, how | |
| Additional filtering | Was there any additional filtering performed in the analysis process | |
| Threshold for EMG scoring | Which threshold was used to score EMG events | |
| Definition of event | How was an event defined | |
| Sleep bruxism outcomes | Use of RMMA term as outcome variable | Yes/no |
| Diagnosis of ‘sleep bruxer’ through cut‐off criteria | Were cut‐off criteria used to define a bruxer, and if so, which | |
| Reported outcomes | Which sleep bruxism outcomes are reported |
Abbreviations: A/D, analog‐to‐digital; EMG, electromyographic; MVC, maximum voluntary contraction.