condition mean min max ZT0-3 3.26485 3.26485 3.26485 ZT4-7 1.7548249999999999 1.7548249999999999 1.7548249999999999 ZT8-11 1.6977600000000002 1.6977600000000002 1.6977600000000002 ZT12-15 4.358485 4.358485 4.358485 ZT16-19 5.027475000000001 5.027475000000001 5.027475000000001 ZT20-23 5.600210000000001 5.600210000000001 5.600210000000001