condition mean min max ZT0-3 38.6233 36.262950000000004 40.98365 ZT4-7 26.258499999999998 26.258499999999998 26.258499999999998 ZT8-11 27.5721 27.5721 27.5721 ZT12-15 0 0 0 ZT16-19 35.62095 35.62095 35.62095 ZT20-23 38.4286 38.4286 38.4286