condition mean min max ZT0-3 2216.9 2216.9 2216.9 ZT4-7 2921.1 2921.1 2921.1 ZT8-11 2856.3999999999996 2856.3999999999996 2856.3999999999996 ZT12-15 2321.3 2321.3 2321.3 ZT16-19 2197.8 2197.8 2197.8 ZT20-23 1974.9 1974.9 1974.9