condition mean min max ZT0-3 14.0062 13.111699999999999 14.9007 ZT4-7 12.3331 12.3331 12.3331 ZT8-11 20.6327 20.6327 20.6327 ZT12-15 0 0 0 ZT16-19 21.362099999999998 21.362099999999998 21.362099999999998 ZT20-23 15.78855 15.78855 15.78855