condition mean min max ZT0-3 16.924799999999998 16.47145 17.378149999999998 ZT4-7 16.167900000000003 16.167900000000003 16.167900000000003 ZT8-11 16.04515 16.04515 16.04515 ZT12-15 0 0 0 ZT16-19 15.9391 15.9391 15.9391 ZT20-23 18.41135 18.41135 18.41135