condition mean min max ZT0-3 19.36975 17.77055 22.367350000000002 ZT4-7 33.24355 33.24355 33.24355 ZT8-11 60.03360000000001 60.03360000000001 60.03360000000001 ZT12-15 62.789300000000004 52.278850000000006 73.29975 ZT16-19 36.994150000000005 36.994150000000005 36.994150000000005 ZT20-23 27.7912 27.7912 27.7912