condition mean min max ZT0-3 9.653590000000001 8.923635 10.918105 ZT4-7 6.510355000000001 6.510355000000001 6.510355000000001 ZT8-11 5.834265 5.834265 5.834265 ZT12-15 7.864225 5.583410000000001 10.14504 ZT16-19 6.594095 6.594095 6.594095 ZT20-23 8.103855 8.103855 8.103855