condition mean min max ZT0-3 213.75 213.75 213.75 ZT4-7 204.7 204.7 204.7 ZT8-11 159.0 159.0 159.0 ZT12-15 133.75 133.75 133.75 ZT16-19 292.8 292.8 292.8 ZT20-23 346.6 346.6 346.6