condition mean min max ZT0-3 23.47535 23.47535 23.47535 ZT4-7 19.25075 19.25075 19.25075 ZT8-11 12.936900000000001 12.936900000000001 12.936900000000001 ZT12-15 15.7409 15.7409 15.7409 ZT16-19 19.8443 19.8443 19.8443 ZT20-23 22.111800000000002 22.111800000000002 22.111800000000002