condition mean min max ZT0-3 27.941450000000003 27.763350000000003 28.11955 ZT4-7 23.29615 23.29615 23.29615 ZT8-11 19.7836 19.7836 19.7836 ZT12-15 0 0 0 ZT16-19 24.978099999999998 24.978099999999998 24.978099999999998 ZT20-23 33.63355 33.63355 33.63355