condition mean min max ZT0-3 16.20765 16.20765 16.20765 ZT4-7 12.2162 12.2162 12.2162 ZT8-11 11.790700000000001 11.790700000000001 11.790700000000001 ZT12-15 16.8776 16.8776 16.8776 ZT16-19 21.427149999999997 21.427149999999997 21.427149999999997 ZT20-23 19.4542 19.4542 19.4542