condition mean min max ZT0-3 50.94085 50.94085 50.94085 ZT4-7 37.96115 37.96115 37.96115 ZT8-11 48.4666 48.4666 48.4666 ZT12-15 62.91265 62.91265 62.91265 ZT16-19 68.11359999999999 68.11359999999999 68.11359999999999 ZT20-23 61.9744 61.9744 61.9744