condition mean min max ZT0-3 4.79665 4.79665 4.79665 ZT4-7 3.361765 3.361765 3.361765 ZT8-11 3.8365299999999998 3.8365299999999998 3.8365299999999998 ZT12-15 5.040395 5.040395 5.040395 ZT16-19 9.02173 9.02173 9.02173 ZT20-23 6.1528599999999996 6.1528599999999996 6.1528599999999996