condition mean min max ZT0-3 440.75 440.75 440.75 ZT4-7 323.5 323.5 323.5 ZT8-11 301.0 301.0 301.0 ZT12-15 273.85 273.85 273.85 ZT16-19 322.15 322.15 322.15 ZT20-23 396.85 396.85 396.85