condition mean min max ZT0-3 8.3228375 7.9334050000000005 8.71227 ZT4-7 4.261065 4.261065 4.261065 ZT8-11 9.35848 9.35848 9.35848 ZT12-15 0 0 0 ZT16-19 13.72365 13.72365 13.72365 ZT20-23 8.706040000000002 8.706040000000002 8.706040000000002