condition mean min max ZT0-3 35.35966666666667 27.42935 41.071200000000005 ZT4-7 25.03165 25.03165 25.03165 ZT8-11 24.815150000000003 24.815150000000003 24.815150000000003 ZT12-15 29.217875 29.13065 29.3051 ZT16-19 29.064349999999997 29.064349999999997 29.064349999999997 ZT20-23 38.672349999999994 38.672349999999994 38.672349999999994