condition mean min max ZT0-3 294.867262 294.867262 294.867262 ZT4-7 340.36512849999997 340.36512849999997 340.36512849999997 ZT8-11 381.4035235 381.4035235 381.4035235 ZT12-15 438.91286449999996 438.91286449999996 438.91286449999996 ZT16-19 334.179131 334.179131 334.179131 ZT20-23 336.629003 336.629003 336.629003