condition mean min max ZT0-3 0.940577 0.9211320000000001 0.9600219999999999 ZT4-7 0.3053625 0.3053625 0.3053625 ZT8-11 4.268505 4.268505 4.268505 ZT12-15 0 0 0 ZT16-19 0.7766435 0.7766435 0.7766435 ZT20-23 1.2557385 1.2557385 1.2557385