condition mean min max ZT0-3 339.7 339.7 339.7 ZT4-7 245.9 245.9 245.9 ZT8-11 278.65 278.65 278.65 ZT12-15 245.6 245.6 245.6 ZT16-19 318.0 318.0 318.0 ZT20-23 276.35 276.35 276.35