condition mean min max ZT0-3 11.114599 11.114599 11.114599 ZT4-7 11.294777499999999 11.294777499999999 11.294777499999999 ZT8-11 10.530907500000001 10.530907500000001 10.530907500000001 ZT12-15 10.22081 10.22081 10.22081 ZT16-19 12.1541005 12.1541005 12.1541005 ZT20-23 10.7304635 10.7304635 10.7304635