condition mean min max ZT0-3 0.291495 0.2669285 0.3160615 ZT4-7 0.213834 0.213834 0.213834 ZT8-11 0.32113749999999996 0.32113749999999996 0.32113749999999996 ZT12-15 0 0 0 ZT16-19 0.472414 0.472414 0.472414 ZT20-23 0.1584515 0.1584515 0.1584515