condition mean min max ZT0-3 25.2 25.2 25.2 ZT4-7 9.5 9.5 9.5 ZT8-11 20.9 20.9 20.9 ZT12-15 32.349999999999994 32.349999999999994 32.349999999999994 ZT16-19 19.4 19.4 19.4 ZT20-23 7.3999999999999995 7.3999999999999995 7.3999999999999995