condition mean min max ZT0-3 20.392699999999998 20.392699999999998 20.392699999999998 ZT4-7 14.995049999999999 14.995049999999999 14.995049999999999 ZT8-11 16.88935 16.88935 16.88935 ZT12-15 23.79525 23.79525 23.79525 ZT16-19 29.480249999999998 29.480249999999998 29.480249999999998 ZT20-23 25.3784 25.3784 25.3784