condition mean min max ZT0-3 273.85 273.85 273.85 ZT4-7 255.6 255.6 255.6 ZT8-11 251.5 251.5 251.5 ZT12-15 223.7 223.7 223.7 ZT16-19 258.3 258.3 258.3 ZT20-23 260.4 260.4 260.4