condition mean min max ZT0-3 39.43705 39.43705 39.43705 ZT4-7 28.057699999999997 28.057699999999997 28.057699999999997 ZT8-11 40.809749999999994 40.809749999999994 40.809749999999994 ZT12-15 41.425650000000005 41.425650000000005 41.425650000000005 ZT16-19 42.463049999999996 42.463049999999996 42.463049999999996 ZT20-23 34.4481 34.4481 34.4481