condition mean min max ZT0-3 24.75 24.75 24.75 ZT4-7 8.9 8.9 8.9 ZT8-11 30.2 30.2 30.2 ZT12-15 30.1 30.1 30.1 ZT16-19 32.55 32.55 32.55 ZT20-23 44.349999999999994 44.349999999999994 44.349999999999994