condition mean min max ZT0-3 9.925743333333333 5.701784999999999 13.573699999999999 ZT4-7 6.630355 6.630355 6.630355 ZT8-11 8.766935 8.766935 8.766935 ZT12-15 10.59768 9.91481 11.28055 ZT16-19 10.77596 10.77596 10.77596 ZT20-23 15.6417 15.6417 15.6417