condition mean min max ZT0-3 1.0183269954999998 0.729674521 1.30697947 ZT4-7 5.43670003125 3.9097032425 6.96369682 ZT8-11 8.37262750175 7.633804959000001 9.1114500445 ZT12-15 7.086830774 6.9820688615 7.1915926865 ZT16-19 5.15542232575 4.100018754000001 6.2108258974999995 ZT20-23 8.82889118225 8.212221307 9.4455610575