condition mean min max ZT0-3 10.17386 10.17386 10.17386 ZT4-7 2.85879 2.85879 2.85879 ZT8-11 11.83425 11.83425 11.83425 ZT12-15 39.34185 39.34185 39.34185 ZT16-19 38.399 38.399 38.399 ZT20-23 22.6466 22.6466 22.6466