condition mean min max ZT0-3 31.355800000000002 31.355800000000002 31.355800000000002 ZT4-7 37.706900000000005 37.706900000000005 37.706900000000005 ZT8-11 14.75865 14.75865 14.75865 ZT12-15 5.03956 5.03956 5.03956 ZT16-19 8.763235 8.763235 8.763235 ZT20-23 20.49375 20.49375 20.49375