condition mean min max ZT0-3 339.30898 339.30898 339.30898 ZT4-7 417.53301650000003 417.53301650000003 417.53301650000003 ZT8-11 350.5017325 350.5017325 350.5017325 ZT12-15 298.7651615 298.7651615 298.7651615 ZT16-19 284.5829205 284.5829205 284.5829205 ZT20-23 301.322092 301.322092 301.322092