condition mean min max ZT0-3 8.3499487625 4.744820765 11.95507676 ZT4-7 4.9365356225 4.23698342 5.636087825000001 ZT8-11 6.84748156925 6.377323174500001 7.317639964 ZT12-15 6.292351939 6.1458730205 6.4388308575 ZT16-19 7.959186265249999 6.7853122914999995 9.133060238999999 ZT20-23 11.597379061 10.230971077 12.963787045