condition mean min max ZT0-3 17.5524 17.5524 17.5524 ZT4-7 17.255049999999997 17.255049999999997 17.255049999999997 ZT8-11 10.1659 10.1659 10.1659 ZT12-15 9.8324 9.8324 9.8324 ZT16-19 7.868550000000001 7.868550000000001 7.868550000000001 ZT20-23 13.86365 13.86365 13.86365