condition mean min max ZT0-3 10.9 10.9 10.9 ZT4-7 4.7 4.7 4.7 ZT8-11 10.200000000000001 10.200000000000001 10.200000000000001 ZT12-15 15.399999999999999 15.399999999999999 15.399999999999999 ZT16-19 10.55 10.55 10.55 ZT20-23 9.85 9.85 9.85