condition mean min max ZT0-3 3.624276666666667 2.304135 4.3632550000000005 ZT4-7 0.44975299999999996 0.44975299999999996 0.44975299999999996 ZT8-11 0.0 0.0 0.0 ZT12-15 0.16112775000000001 0.076854 0.2454015 ZT16-19 0.2152475 0.2152475 0.2152475 ZT20-23 0.33586 0.33586 0.33586