condition mean min max ZT0-3 74.13081666666668 57.734750000000005 84.47955 ZT4-7 30.75605 30.75605 30.75605 ZT8-11 20.67085 20.67085 20.67085 ZT12-15 30.48455 28.98885 31.980249999999998 ZT16-19 31.37755 31.37755 31.37755 ZT20-23 47.079350000000005 47.079350000000005 47.079350000000005