condition mean min max ZT0-3 1.9573333333333334 1.1171600000000002 2.9576700000000002 ZT4-7 0.9497059999999999 0.9497059999999999 0.9497059999999999 ZT8-11 1.4747320000000002 1.4747320000000002 1.4747320000000002 ZT12-15 2.6704030000000003 1.319346 4.02146 ZT16-19 3.1861800000000002 3.1861800000000002 3.1861800000000002 ZT20-23 2.37385 2.37385 2.37385