condition mean min max ZT0-3 7.642815000000001 7.642815000000001 7.642815000000001 ZT4-7 8.90942 8.90942 8.90942 ZT8-11 7.278285 7.278285 7.278285 ZT12-15 4.00842 4.00842 4.00842 ZT16-19 6.897105 6.897105 6.897105 ZT20-23 5.45995 5.45995 5.45995