condition mean min max ZT0-3 14.0396 13.8439 14.235299999999999 ZT4-7 13.33785 13.33785 13.33785 ZT8-11 15.70585 15.70585 15.70585 ZT12-15 0 0 0 ZT16-19 18.169249999999998 18.169249999999998 18.169249999999998 ZT20-23 17.025399999999998 17.025399999999998 17.025399999999998