condition mean min max ZT0-3 290.847441 290.847441 290.847441 ZT4-7 236.240521 236.240521 236.240521 ZT8-11 236.4046965 236.4046965 236.4046965 ZT12-15 308.98271950000003 308.98271950000003 308.98271950000003 ZT16-19 367.4737615 367.4737615 367.4737615 ZT20-23 332.43825000000004 332.43825000000004 332.43825000000004