condition mean min max ZT0-3 72.34836666666666 69.04735 77.44365 ZT4-7 63.13105 63.13105 63.13105 ZT8-11 85.0212 85.0212 85.0212 ZT12-15 66.20667499999999 58.5509 73.86245 ZT16-19 47.964600000000004 47.964600000000004 47.964600000000004 ZT20-23 59.8518 59.8518 59.8518