Table 1.
Characteristics of included studies and participants’ characteristics of included studies.
| Study | Yr | Country | CG | 0G | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Leptin, ng/mL | n | Leptin, ng/mL | n | Age, yr | AHI, events/h | BMI, Kg/m2 | |||||
| Mean | SD | Mean | SD | ||||||||
| Dalesio | 2020 | USA | 7.4 | 8.8 | 18 | 28.8 | 21.3 | 13 | 7 | ≥10 | ≥28 |
| Li (1) | 2010 | China | 14.1 | 15.4 | 43 | 15.77 | 14.7 | 14 | 9.32 | 19.4 | 17.99 |
| Li (2) | 2010 | China | 48.38 | 23 | 55 | 41.27 | 20.7 | 29 | 11.66 | 11.2 | 28.02 |
| Canapari | 2011 | USA | 21.18 | 7.77 | 16 | 32.19 | 8.27 | 15 | 12.7 | 6.26 | 43.9 |
| Bhatt | 2021 | India | 9.5 | 3.5 | 57 | 19.2 | 8.2 | 190 | 10.71 | 13.3 | 27.1 |
| Roche | 2020 | France, Brazil | 65.91 | 31.78 | 8 | 54.14 | 20.37 | 11 | 15.4 | 6.2 | 39.6 |
AHI = apnea hypopnea index, BMI = body mass index, CG = control group, n = Sample size, OG = obstructive sleep apnea (OSA) group, SD = standard deviation.