condition mean min max ZT0-3 264.3 264.3 264.3 ZT4-7 216.4 216.4 216.4 ZT8-11 275.6 275.6 275.6 ZT12-15 263.4 263.4 263.4 ZT16-19 267.70000000000005 267.70000000000005 267.70000000000005 ZT20-23 251.25 251.25 251.25