condition mean min max ZT0-3 1546.3000000000002 1546.3000000000002 1546.3000000000002 ZT4-7 1755.8 1755.8 1755.8 ZT8-11 1838.55 1838.55 1838.55 ZT12-15 2191.5 2191.5 2191.5 ZT16-19 1720.6 1720.6 1720.6 ZT20-23 1653.25 1653.25 1653.25