condition mean min max ZT0-3 15.6154 15.6154 15.6154 ZT4-7 11.33795 11.33795 11.33795 ZT8-11 12.508199999999999 12.508199999999999 12.508199999999999 ZT12-15 14.320450000000001 14.320450000000001 14.320450000000001 ZT16-19 16.4924 16.4924 16.4924 ZT20-23 14.78755 14.78755 14.78755