condition mean min max ZT0-3 7.983474999999999 7.983474999999999 7.983474999999999 ZT4-7 5.674015000000001 5.674015000000001 5.674015000000001 ZT8-11 6.411965 6.411965 6.411965 ZT12-15 6.02144 6.02144 6.02144 ZT16-19 8.098535 8.098535 8.098535 ZT20-23 8.79074 8.79074 8.79074