condition mean min max ZT0-3 10.5 10.5 10.5 ZT4-7 14.4 14.4 14.4 ZT8-11 49.349999999999994 49.349999999999994 49.349999999999994 ZT12-15 60.650000000000006 60.650000000000006 60.650000000000006 ZT16-19 57.6 57.6 57.6 ZT20-23 10.85 10.85 10.85