condition mean min max ZT0-3 56.349999999999994 56.349999999999994 56.349999999999994 ZT4-7 15.7 15.7 15.7 ZT8-11 38.75 38.75 38.75 ZT12-15 41.7 41.7 41.7 ZT16-19 89.55000000000001 89.55000000000001 89.55000000000001 ZT20-23 70.5 70.5 70.5