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. Author manuscript; available in PMC: 2013 Dec 1.
Published in final edited form as: Int J Obes (Lond). 2012 Sep 11;37(6):835–842. doi: 10.1038/ijo.2012.138

Table 3.

Pearson correlation between leptin levels in serum to OSA severity in the study cohort (n = 452) and for the 3 different BMI categories. Significant p-values for assessment of correlation are in bold (p<0.05).

Pearson correlation coefficients with log(leptin) level
All BMI < 30
kg/m2 		BMI ≥30 and
<35 kg/m2 		BMI ≥35
kg/m2
n = 452 n = 156 n = 162 n = 134
r p r p r p r p
Apnea-hypopnea index −0.04 0.40 0.01 0.86 −0.14 0.07 −0.09 0.30
Oxygen desaturation index 0.05 0.32 0.02 0.85 −0.13 0.10 −0.07 0.43
Minimum SaO2 (%) −0.17 0.0003 −0.04 0.66 −0.12 0.13 −0.05 0.60
Hypoxia time (minutes) 0.20 <0.0001 0.13 0.11 0.08 0.34 0.14 0.11

Note: Similar correlations were obtained when assessed using Spearman correlation, the complete cohort (n=520) and when analyses were adjusted for gender.