condition mean min max ZT0-3 60.025675 55.00165 65.0497 ZT4-7 52.35205 52.35205 52.35205 ZT8-11 60.7339 60.7339 60.7339 ZT12-15 0 0 0 ZT16-19 67.0712 67.0712 67.0712 ZT20-23 58.46855 58.46855 58.46855