condition mean min max ZT0-3 47.36244 47.36244 47.36244 ZT4-7 67.250722 67.250722 67.250722 ZT8-11 83.11955499999999 83.11955499999999 83.11955499999999 ZT12-15 71.3363325 71.3363325 71.3363325 ZT16-19 56.0830725 56.0830725 56.0830725 ZT20-23 50.026737499999996 50.026737499999996 50.026737499999996