condition mean min max ZT0-3 159.9 159.9 159.9 ZT4-7 151.2 151.2 151.2 ZT8-11 181.45 181.45 181.45 ZT12-15 282.0 282.0 282.0 ZT16-19 271.45 271.45 271.45 ZT20-23 239.2 239.2 239.2