condition mean min max ZT0-3 73.4452 65.02965 79.93435 ZT4-7 55.01505 55.01505 55.01505 ZT8-11 39.953199999999995 39.953199999999995 39.953199999999995 ZT12-15 48.915274999999994 46.06695 51.7636 ZT16-19 48.93965 48.93965 48.93965 ZT20-23 64.53375 64.53375 64.53375