condition mean min max ZT0-3 72.80888888666667 72.80888888666667 72.80888888666667 ZT4-7 72.37277777999999 72.37277777999999 72.37277777999999 ZT8-11 73.25888889 73.25888889 73.25888889 ZT12-15 58.18222222 58.18222222 58.18222222 ZT16-19 64.48111111 64.48111111 64.48111111 ZT20-23 70.77777777666667 70.77777777666667 70.77777777666667