condition mean min max ZT0-3 34.512343 34.512343 34.512343 ZT4-7 45.8711545 45.8711545 45.8711545 ZT8-11 37.2158355 37.2158355 37.2158355 ZT12-15 36.703283 36.703283 36.703283 ZT16-19 30.114738000000003 30.114738000000003 30.114738000000003 ZT20-23 30.5104715 30.5104715 30.5104715