condition mean min max ZT0-3 12.399999999999999 12.399999999999999 12.399999999999999 ZT4-7 206.5 206.5 206.5 ZT8-11 223.3 223.3 223.3 ZT12-15 141.14999999999998 141.14999999999998 141.14999999999998 ZT16-19 123.85 123.85 123.85 ZT20-23 9.9 9.9 9.9