condition mean min max ZT0-3 7.47653 7.47653 7.47653 ZT4-7 6.25 6.25 6.25 ZT8-11 7.093855 7.093855 7.093855 ZT12-15 6.0057 6.0057 6.0057 ZT16-19 10.7601 10.7601 10.7601 ZT20-23 7.136755 7.136755 7.136755