condition mean min max ZT0-3 33.7107 33.7107 33.7107 ZT4-7 29.9897 29.9897 29.9897 ZT8-11 21.1747 21.1747 21.1747 ZT12-15 19.5626 19.5626 19.5626 ZT16-19 13.446950000000001 13.446950000000001 13.446950000000001 ZT20-23 25.7461 25.7461 25.7461