condition mean min max ZT0-3 247.5 247.5 247.5 ZT4-7 116.8 116.8 116.8 ZT8-11 133.85000000000002 133.85000000000002 133.85000000000002 ZT12-15 191.3 191.3 191.3 ZT16-19 303.55 303.55 303.55 ZT20-23 211.2 211.2 211.2