condition mean min max ZT0-3 5.581664999999999 5.581664999999999 5.581664999999999 ZT4-7 3.544175 3.544175 3.544175 ZT8-11 4.03063 4.03063 4.03063 ZT12-15 5.37665 5.37665 5.37665 ZT16-19 6.38263 6.38263 6.38263 ZT20-23 5.4635750000000005 5.4635750000000005 5.4635750000000005