condition mean min max ZT0-3 1148.8 1148.8 1148.8 ZT4-7 844.6 844.6 844.6 ZT8-11 1011.6 1011.6 1011.6 ZT12-15 859.6999999999999 859.6999999999999 859.6999999999999 ZT16-19 894.35 894.35 894.35 ZT20-23 1271.5 1271.5 1271.5