condition mean min max ZT0-3 81.94999999999999 81.94999999999999 81.94999999999999 ZT4-7 71.0 71.0 71.0 ZT8-11 47.55 47.55 47.55 ZT12-15 68.8 68.8 68.8 ZT16-19 60.7 60.7 60.7 ZT20-23 64.65 64.65 64.65