condition mean min max ZT0-3 9.848005 9.848005 9.848005 ZT4-7 8.031395 8.031395 8.031395 ZT8-11 9.361435 9.361435 9.361435 ZT12-15 11.135750000000002 11.135750000000002 11.135750000000002 ZT16-19 10.856300000000001 10.856300000000001 10.856300000000001 ZT20-23 10.279810000000001 10.279810000000001 10.279810000000001