condition mean min max ZT0-3 22.287616666666665 17.82725 24.66195 ZT4-7 12.523050000000001 12.523050000000001 12.523050000000001 ZT8-11 14.0456 14.0456 14.0456 ZT12-15 14.3735 13.741900000000001 15.0051 ZT16-19 14.8664 14.8664 14.8664 ZT20-23 25.7451 25.7451 25.7451