condition mean min max ZT0-3 227.05200000000002 227.05200000000002 227.05200000000002 ZT4-7 192.881 192.881 192.881 ZT8-11 171.359 171.359 171.359 ZT12-15 185.066 185.066 185.066 ZT16-19 188.625 188.625 188.625 ZT20-23 225.234 225.234 225.234