condition mean min max ZT0-3 12.0491 12.0491 12.0491 ZT4-7 10.042750000000002 10.042750000000002 10.042750000000002 ZT8-11 8.463000000000001 8.463000000000001 8.463000000000001 ZT12-15 8.617945 8.617945 8.617945 ZT16-19 10.760100000000001 10.760100000000001 10.760100000000001 ZT20-23 14.2453 14.2453 14.2453