condition mean min max ZT0-3 13.15 13.15 13.15 ZT4-7 10.7 10.7 10.7 ZT8-11 26.7 26.7 26.7 ZT12-15 11.100000000000001 11.100000000000001 11.100000000000001 ZT16-19 12.649999999999999 12.649999999999999 12.649999999999999 ZT20-23 11.399999999999999 11.399999999999999 11.399999999999999