condition mean min max ZT0-3 12.04915 12.04915 12.04915 ZT4-7 10.859513 10.859513 10.859513 ZT8-11 15.289460000000002 15.289460000000002 15.289460000000002 ZT12-15 13.6109095 13.6109095 13.6109095 ZT16-19 12.0886335 12.0886335 12.0886335 ZT20-23 12.310983 12.310983 12.310983