condition mean min max ZT0-3 25.90265 25.90265 25.90265 ZT4-7 20.166249999999998 20.166249999999998 20.166249999999998 ZT8-11 21.126649999999998 21.126649999999998 21.126649999999998 ZT12-15 18.141550000000002 18.141550000000002 18.141550000000002 ZT16-19 29.4724 29.4724 29.4724 ZT20-23 25.1696 25.1696 25.1696