condition mean min max ZT0-3 5.4 5.4 5.4 ZT4-7 54.7 54.7 54.7 ZT8-11 4.0 4.0 4.0 ZT12-15 22.0 22.0 22.0 ZT16-19 14.5 14.5 14.5 ZT20-23 39.349999999999994 39.349999999999994 39.349999999999994