condition mean min max ZT0-3 192.385903 192.385903 192.385903 ZT4-7 323.7191395 323.7191395 323.7191395 ZT8-11 297.8240775 297.8240775 297.8240775 ZT12-15 275.0749075 275.0749075 275.0749075 ZT16-19 225.3057305 225.3057305 225.3057305 ZT20-23 207.29707000000002 207.29707000000002 207.29707000000002