condition mean min max ZT0-3 24.5801 22.729550000000003 26.43065 ZT4-7 13.451 13.451 13.451 ZT8-11 11.964500000000001 11.964500000000001 11.964500000000001 ZT12-15 0 0 0 ZT16-19 16.7066 16.7066 16.7066 ZT20-23 20.294249999999998 20.294249999999998 20.294249999999998