condition mean min max ZT0-3 476.75 476.75 476.75 ZT4-7 213.9 213.9 213.9 ZT8-11 307.65 307.65 307.65 ZT12-15 396.4 396.4 396.4 ZT16-19 508.6 508.6 508.6 ZT20-23 696.2 696.2 696.2