condition mean min max ZT0-3 139.754418 139.754418 139.754418 ZT4-7 98.380879 98.380879 98.380879 ZT8-11 78.0216755 78.0216755 78.0216755 ZT12-15 397.1449915 397.1449915 397.1449915 ZT16-19 108.6409805 108.6409805 108.6409805 ZT20-23 511.6367355 511.6367355 511.6367355