condition mean min max ZT0-3 60.68613333333334 27.06465 78.04695000000001 ZT4-7 19.930100000000003 19.930100000000003 19.930100000000003 ZT8-11 22.66755 22.66755 22.66755 ZT12-15 39.572025 30.8283 48.315749999999994 ZT16-19 64.38995 64.38995 64.38995 ZT20-23 94.4677 94.4677 94.4677