Table 4.
Reference intervals of serum leptin (ng/ml) in each gender by BMI
| Sex and BMI (kg/m2) | Mean ± SD | 2.5th, 97.5th | 25th | 50th | 75th |
|---|---|---|---|---|---|
| Men | |||||
| All BMI (n = 469) | 6.45 ± 5.53 | 0.33, 19.85 | 2.62 | 5.20 | 8.65 |
| < 20 (n = 34) | 1.26 ± 1.10 | 0.16, −* | 0.34 | 0.90 | 1.86 |
| 20 to < 25 (n = 198) | 4.08 ± 3.14 | 0.42, 12.32 | 1.90 | 3.26 | 5.44 |
| 25 to < 27.5 (n = 127) | 7.29 ± 5.73 | 2.17, 20.22 | 4.31 | 6.14 | 8.61 |
| 27.5 to < 30 (n = 66) | 9.32 ± 3.93 | 2.86, 19.41 | 6.36 | 8.98 | 11.50 |
| ≥ 30 (n = 44) | 14.42 ± 6.33 | 4.50, 30.20 | 8.98 | 13.66 | 18.18 |
| Women | |||||
| All BMI (n = 773) | 20.92 ± 12.96 | 3.60, 54.86 | 11.87 | 17.90 | 26.88 |
| < 20 (n = 53) | 9.23 ± 5.61 | 1.04, 22.74 | 4.78 | 8.34 | 12.74 |
| 20 to < 25 (n = 403) | 16.29 ± 8.96 | 4.11, 38.09 | 9.96 | 14.92 | 20.53 |
| 25 to < 27.5 (n = 172) | 24.27 ± 11.01 | 8.27, 48.66 | 16.33 | 22.24 | 31.47 |
| 27.5 to < 30 (n = 85) | 29.31 ± 11.47 | 13.71, 62.54 | 21.01 | 26.20 | 36.20 |
| ≥ 30 (n = 60) | 40.85 ± 16.62 | 14.32, 80.96 | 27.75 | 40.09 | 51.50 |
*We didn’t get the 97.5th of leptin concentrations due to the number limitation of participants in this subgroup