condition mean min max ZT0-3 12.370766666666666 11.050699999999999 13.303650000000001 ZT4-7 9.690035 9.690035 9.690035 ZT8-11 9.399235 9.399235 9.399235 ZT12-15 8.29224 7.788365000000001 8.796115 ZT16-19 11.59245 11.59245 11.59245 ZT20-23 8.910345 8.910345 8.910345