condition mean min max ZT0-3 2.904185 1.884585 3.9237849999999996 ZT4-7 4.20091 4.20091 4.20091 ZT8-11 3.7731749999999997 3.7731749999999997 3.7731749999999997 ZT12-15 0 0 0 ZT16-19 3.703825 3.703825 3.703825 ZT20-23 4.342195 4.342195 4.342195