condition mean min max ZT0-3 76.765663 76.765663 76.765663 ZT4-7 282.6414045 282.6414045 282.6414045 ZT8-11 267.057404 267.057404 267.057404 ZT12-15 158.8679525 158.8679525 158.8679525 ZT16-19 51.1650415 51.1650415 51.1650415 ZT20-23 18.742534 18.742534 18.742534