(b)
| Author | Neuropathy definition | Matched age and sex | Matched obesity | ||
|---|---|---|---|---|---|
| Autonomic | Peripheral | Evaluation of diabetic neuropathy | |||
| Nomura et al. (2013) [27] | No | Yes | DTR, vibration, dysesthesia | Yes | Yes |
| Tahrani et al. (2012) [26] | No | Yes | MNSI examinations scores, MNSI questionnaire scores | Yes | Yes |
| Laaban et al. (2009) [23] | No | Yes | Patient's records | No | No |
| Takahashi et al. (2003) [24] | No | No | Not described | No | No |
| Ficker et al. (1998) [22] | Yes | No | CV, RMSSD, E-I difference, E/I ratio, maximum/minimum 30 : 15 ratio | No | No |
Abbreviations: AHI: apnea hypoxia index; BMI: body mass index; CV: coefficient of variation; DM: diabetes mellitus; DN: diabetic neuropathy, DTR: deep tendon reflexes; MNSI: Michigan neuropathy screening instrument; ODI: oxygen desaturation index; RMSSD: root mean square of successive difference; RDI: respiratory disturbance index; SA: sleep apnea; T1DM: type 1 diabetes mellitus; T2DM: type 2 diabetes mellitus.