condition mean min max ZT0-3 18.1417 18.1417 18.1417 ZT4-7 13.12035 13.12035 13.12035 ZT8-11 13.33745 13.33745 13.33745 ZT12-15 15.193000000000001 15.193000000000001 15.193000000000001 ZT16-19 22.92875 22.92875 22.92875 ZT20-23 17.7183 17.7183 17.7183