condition mean min max ZT0-3 3141.606434 3141.606434 3141.606434 ZT4-7 3757.024407 3757.024407 3757.024407 ZT8-11 4483.7119285 4483.7119285 4483.7119285 ZT12-15 4487.048251 4487.048251 4487.048251 ZT16-19 4646.253891 4646.253891 4646.253891 ZT20-23 4883.9940105 4883.9940105 4883.9940105