condition mean min max ZT0-3 21.1095 21.1095 21.1095 ZT4-7 24.4067 24.4067 24.4067 ZT8-11 20.226300000000002 20.226300000000002 20.226300000000002 ZT12-15 10.36968 10.36968 10.36968 ZT16-19 12.536285 12.536285 12.536285 ZT20-23 11.99475 11.99475 11.99475