condition mean min max ZT0-3 7.0167025 6.8588450000000005 7.17456 ZT4-7 3.45508 3.45508 3.45508 ZT8-11 3.092065 3.092065 3.092065 ZT12-15 0 0 0 ZT16-19 4.63875 4.63875 4.63875 ZT20-23 4.004474999999999 4.004474999999999 4.004474999999999