condition mean min max ZT0-3 48.65078333333334 31.312350000000002 60.90145 ZT4-7 20.30715 20.30715 20.30715 ZT8-11 15.78665 15.78665 15.78665 ZT12-15 18.245224999999998 15.151299999999999 21.33915 ZT16-19 23.9852 23.9852 23.9852 ZT20-23 41.424549999999996 41.424549999999996 41.424549999999996