condition mean min max ZT0-3 7.805789999999999 6.598955 8.560559999999999 ZT4-7 7.124594999999999 7.124594999999999 7.124594999999999 ZT8-11 9.72313 9.72313 9.72313 ZT12-15 13.617125 12.7696 14.464649999999999 ZT16-19 10.059750000000001 10.059750000000001 10.059750000000001 ZT20-23 9.999925000000001 9.999925000000001 9.999925000000001