condition mean min max ZT0-3 16.81185 16.81185 16.81185 ZT4-7 14.917300000000001 14.917300000000001 14.917300000000001 ZT8-11 13.7543 13.7543 13.7543 ZT12-15 14.931750000000001 14.931750000000001 14.931750000000001 ZT16-19 16.40435 16.40435 16.40435 ZT20-23 15.6051 15.6051 15.6051