condition mean min max ZT0-3 9.5433506045 7.230229499 11.856471710000001 ZT4-7 11.654627655999999 10.512537617 12.796717695 ZT8-11 10.154246166 9.8132553495 10.4952369825 ZT12-15 7.331560309 6.8767455665 7.7863750515 ZT16-19 7.8864834725 5.8259397505 9.9470271945 ZT20-23 15.900733217500001 15.232691835 16.5687746