condition mean min max ZT0-3 16.1 16.1 16.1 ZT4-7 16.9 16.9 16.9 ZT8-11 3.0 3.0 3.0 ZT12-15 28.85 28.85 28.85 ZT16-19 8.7 8.7 8.7 ZT20-23 12.399999999999999 12.399999999999999 12.399999999999999