Characteristics of 99 patients showing positive 18F-FDG BAT uptake at first scan and their characteristics at first subsequent negative scan; day length and temperatures the day of the scan and 24 h and 48 h before.

Data are expressed as mean ± standard deviation (SD). N.S., not significant. Statistical differences between groups were analyzed by Student’s t-test.数据以均值±标准差（standard deviation, SD）表示。注：N.S. 指无显著性差异（not significant）。组间统计学差异通过Student t检验（Student’s t-test）进行分析。