condition mean min max ZT0-3 595.5 595.5 595.5 ZT4-7 503.2 503.2 503.2 ZT8-11 441.7 441.7 441.7 ZT12-15 254.5 254.5 254.5 ZT16-19 122.30000000000001 122.30000000000001 122.30000000000001 ZT20-23 204.3 204.3 204.3