condition mean min max ZT0-3 22.442148 22.442148 22.442148 ZT4-7 18.172965 18.172965 18.172965 ZT8-11 19.967723499999998 19.967723499999998 19.967723499999998 ZT12-15 19.891086 19.891086 19.891086 ZT16-19 21.7054225 21.7054225 21.7054225 ZT20-23 22.936591 22.936591 22.936591