condition mean min max ZT0-3 28.479275 24.831200000000003 32.12735 ZT4-7 18.78295 18.78295 18.78295 ZT8-11 17.63045 17.63045 17.63045 ZT12-15 0 0 0 ZT16-19 20.14245 20.14245 20.14245 ZT20-23 22.75955 22.75955 22.75955