condition mean min max ZT0-3 48.349999999999994 48.349999999999994 48.349999999999994 ZT4-7 26.3 26.3 26.3 ZT8-11 72.55 72.55 72.55 ZT12-15 119.85 119.85 119.85 ZT16-19 89.4 89.4 89.4 ZT20-23 16.15 16.15 16.15