condition mean min max ZT0-3 7.6767475 6.439465 8.91403 ZT4-7 8.281134999999999 8.281134999999999 8.281134999999999 ZT8-11 11.889700000000001 11.889700000000001 11.889700000000001 ZT12-15 0 0 0 ZT16-19 12.055599999999998 12.055599999999998 12.055599999999998 ZT20-23 11.867450000000002 11.867450000000002 11.867450000000002