condition mean min max ZT0-3 18.8125 18.8125 18.8125 ZT4-7 14.414850000000001 14.414850000000001 14.414850000000001 ZT8-11 7.509510000000001 7.509510000000001 7.509510000000001 ZT12-15 7.3541 7.3541 7.3541 ZT16-19 14.093350000000001 14.093350000000001 14.093350000000001 ZT20-23 18.04275 18.04275 18.04275