condition mean min max ZT0-3 2.69006 2.19502 3.09166 ZT4-7 2.62323 2.62323 2.62323 ZT8-11 2.701125 2.701125 2.701125 ZT12-15 4.4472499999999995 4.266195 4.628304999999999 ZT16-19 3.7244599999999997 3.7244599999999997 3.7244599999999997 ZT20-23 4.092515000000001 4.092515000000001 4.092515000000001