condition mean min max ZT0-3 4.7349725 4.6169899999999995 4.852955 ZT4-7 4.561394999999999 4.561394999999999 4.561394999999999 ZT8-11 5.51025 5.51025 5.51025 ZT12-15 0 0 0 ZT16-19 6.02144 6.02144 6.02144 ZT20-23 6.048605 6.048605 6.048605