condition mean min max ZT0-3 6.05 6.05 6.05 ZT4-7 8.8 8.8 8.8 ZT8-11 28.349999999999998 28.349999999999998 28.349999999999998 ZT12-15 38.45 38.45 38.45 ZT16-19 43.5 43.5 43.5 ZT20-23 7.800000000000001 7.800000000000001 7.800000000000001