condition mean min max ZT0-3 0.27402072325000004 0.247425615 0.30061583150000004 ZT4-7 0.45150582549999996 0.1579884185 0.7450232324999999 ZT8-11 3.0112261555 2.012564864 4.0098874470000005 ZT12-15 8.3099577845 6.62750031 9.992415259 ZT16-19 6.477727107249999 6.0326559904999995 6.922798223999999 ZT20-23 4.98292163825 4.645094228 5.3207490485