condition mean min max ZT0-3 1.2711043333333334 0.6598930000000001 1.86775 ZT4-7 2.946045 2.946045 2.946045 ZT8-11 1.574195 1.574195 1.574195 ZT12-15 1.40079 1.262965 1.538615 ZT16-19 2.409085 2.409085 2.409085 ZT20-23 1.9630299999999998 1.9630299999999998 1.9630299999999998