condition mean min max ZT0-3 34.08918333333333 30.52825 36.64335 ZT4-7 25.4995 25.4995 25.4995 ZT8-11 38.0934 38.0934 38.0934 ZT12-15 32.231025 30.3127 34.14935 ZT16-19 13.4769 13.4769 13.4769 ZT20-23 13.42035 13.42035 13.42035