condition mean min max ZT0-3 107.672339 107.672339 107.672339 ZT4-7 114.378106 114.378106 114.378106 ZT8-11 128.076727 128.076727 128.076727 ZT12-15 93.3897835 93.3897835 93.3897835 ZT16-19 86.297303 86.297303 86.297303 ZT20-23 60.0092 60.0092 60.0092