condition mean min max ZT0-3 158.25 158.25 158.25 ZT4-7 132.6 132.6 132.6 ZT8-11 141.64999999999998 141.64999999999998 141.64999999999998 ZT12-15 165.2 165.2 165.2 ZT16-19 237.10000000000002 237.10000000000002 237.10000000000002 ZT20-23 201.95000000000002 201.95000000000002 201.95000000000002