condition mean min max ZT0-3 13.886523333333335 11.391770000000001 17.20745 ZT4-7 33.93985 33.93985 33.93985 ZT8-11 31.6333 31.6333 31.6333 ZT12-15 16.4178 14.948649999999999 17.88695 ZT16-19 11.583749999999998 11.583749999999998 11.583749999999998 ZT20-23 11.49323 11.49323 11.49323