condition mean min max ZT0-3 19.929650000000002 19.929650000000002 19.929650000000002 ZT4-7 17.8679 17.8679 17.8679 ZT8-11 21.51405 21.51405 21.51405 ZT12-15 13.662199999999999 13.662199999999999 13.662199999999999 ZT16-19 13.33205 13.33205 13.33205 ZT20-23 10.46345 10.46345 10.46345