condition mean min max ZT0-3 13.837299999999999 13.837299999999999 13.837299999999999 ZT4-7 8.68594 8.68594 8.68594 ZT8-11 10.9666 10.9666 10.9666 ZT12-15 15.30935 15.30935 15.30935 ZT16-19 16.14745 16.14745 16.14745 ZT20-23 12.551 12.551 12.551