condition mean min max ZT0-3 1.36483 1.2173699999999998 1.5122900000000001 ZT4-7 1.296044 1.296044 1.296044 ZT8-11 1.131095 1.131095 1.131095 ZT12-15 0 0 0 ZT16-19 3.0981050000000003 3.0981050000000003 3.0981050000000003 ZT20-23 1.91453 1.91453 1.91453