condition mean min max ZT0-3 1.9500000000000002 1.9500000000000002 1.9500000000000002 ZT4-7 14.7 14.7 14.7 ZT8-11 33.5 33.5 33.5 ZT12-15 10.899999999999999 10.899999999999999 10.899999999999999 ZT16-19 8.85 8.85 8.85 ZT20-23 11.4 11.4 11.4