condition mean min max ZT0-3 1.6367475 1.62289 1.650605 ZT4-7 1.19764 1.19764 1.19764 ZT8-11 2.057855 2.057855 2.057855 ZT12-15 0 0 0 ZT16-19 2.128195 2.128195 2.128195 ZT20-23 1.6933850000000001 1.6933850000000001 1.6933850000000001