condition mean min max ZT0-3 40.3 40.3 40.3 ZT4-7 62.6 62.6 62.6 ZT8-11 33.7 33.7 33.7 ZT12-15 20.15 20.15 20.15 ZT16-19 61.349999999999994 61.349999999999994 61.349999999999994 ZT20-23 26.25 26.25 26.25