condition mean min max ZT0-3 16.1295 16.1295 16.1295 ZT4-7 8.31991 8.31991 8.31991 ZT8-11 15.256 15.256 15.256 ZT12-15 14.4205 14.4205 14.4205 ZT16-19 7.2497799999999994 7.2497799999999994 7.2497799999999994 ZT20-23 12.60625 12.60625 12.60625