condition mean min max ZT0-3 10.658833 10.658833 10.658833 ZT4-7 10.948436000000001 10.948436000000001 10.948436000000001 ZT8-11 9.2603415 9.2603415 9.2603415 ZT12-15 9.9054705 9.9054705 9.9054705 ZT16-19 9.707673 9.707673 9.707673 ZT20-23 10.414538 10.414538 10.414538