condition mean min max ZT0-3 50.45295 48.9925 51.913399999999996 ZT4-7 52.48355 52.48355 52.48355 ZT8-11 44.4794 44.4794 44.4794 ZT12-15 0 0 0 ZT16-19 37.5501 37.5501 37.5501 ZT20-23 54.245450000000005 54.245450000000005 54.245450000000005