The article by Yang et al. entitled “Sleeping Time, BMI, and Body Fat in Chinese Freshmen and Their Interrelation” [Obes Facts. 2020, DOI: 10.1159/000506078] was published with some substantial errors.
In Table 1, the mean BMI of men is 22.1 ± 3.6 and that of women is 20.2 ± 2.5 (p < 0.01). The mean BMI of normal men is 20.5 ± 1.9 and that of normal women is 19.7 ± 1.9 (p < 0.001). The mean BMI of overweight men is 25.6 ± 1.1 and that of overweight women is 25.2 ± 1.0 (p = 0.003). The mean BMI of obese men is 30.5 ± 2.4 and that of obese women is 30.4 ± 2.3 (p = 0.936). The mean fat percentage of the total population is 20.9 ± 5.9. The number of women in the sleeping time >8 h group is 204, so the proportion of men in the sleeping time >8 h group is 34.6% and the proportion of women is 65.4%.
Table 1.
Demographic characteristics of participants according to sex classification
| Total |
Sex |
p | |||
|---|---|---|---|---|---|
| n | % | men (n = 684) | women (n = 1,254) | ||
| Age, yearsa | 20.4±0.8 | 20.5±0.8 | 20.3±0.7 | <0.01 | |
| Ethnicity, n | |||||
| Han | 1,753 | 90.5 | 608 (34.7%) | 1,144 (65.3%) | 0.113 |
| Others | 177 | 9.1 | 72 (40.7%) | 105 (59.3%) | |
| BMIa | 20.9±3.1 | 22.1±3.6 | 20.2±2.5 | <0.01 | |
| Normal | 1,672 | 86.3 | 20.5±1.9 | 19.7±1.9 | <0.001 |
| Overweight | 200 | 10.3 | 25.6±1.1 | 25.2±1.0 | 0.003 |
| Obesity | 64 | 3.3 | 30.5±2.4 | 30.4±2.3 | 0.936 |
| Body fat percentagea | 20.9±5.9 | 17.6±5.7 | 22.7±5.2 | <0.001 | |
| Sleeping time | |||||
| <6 h | 103 | 5.3 | 32 (31.1%) | 71 (68.9%) | 0.631 |
| 6–8 h | 1,513 | 78.1 | 539 (36.3%) | 947 (63.7%) | |
| >8 h | 312 | 16.1 | 108 (34.6%) | 204 (65.4%) | |
Data are shown as mean ± SD.
The authors apologize for these errors and any confusion these may have caused.