condition mean min max ZT0-3 1.21184794575 0.350267557 2.0734283345 ZT4-7 3.85413845775 2.7449700935 4.963306822 ZT8-11 5.65824564725 5.1262867475 6.1902045470000004 ZT12-15 4.789990366 4.7279643445 4.8520163875 ZT16-19 5.1505175549999995 4.3044118115 5.996623298499999 ZT20-23 6.6636267445 6.5312311659999995 6.796022323000001