condition mean min max ZT0-3 15.647075000000001 15.4622 15.83195 ZT4-7 17.91965 17.91965 17.91965 ZT8-11 20.38945 20.38945 20.38945 ZT12-15 0 0 0 ZT16-19 16.0912 16.0912 16.0912 ZT20-23 14.090250000000001 14.090250000000001 14.090250000000001