condition mean min max ZT0-3 60.668846 60.668846 60.668846 ZT4-7 69.5671885 69.5671885 69.5671885 ZT8-11 81.5374295 81.5374295 81.5374295 ZT12-15 80.2856975 80.2856975 80.2856975 ZT16-19 93.938047 93.938047 93.938047 ZT20-23 109.2062 109.2062 109.2062