condition mean min max ZT0-3 9.96875 9.96875 9.96875 ZT4-7 8.36632 8.36632 8.36632 ZT8-11 7.59349 7.59349 7.59349 ZT12-15 9.091595000000002 9.091595000000002 9.091595000000002 ZT16-19 10.3385 10.3385 10.3385 ZT20-23 10.65555 10.65555 10.65555