condition mean min max ZT0-3 12.99645 11.9199 14.073 ZT4-7 13.96 13.96 13.96 ZT8-11 11.166115000000001 11.166115000000001 11.166115000000001 ZT12-15 0 0 0 ZT16-19 9.696290000000001 9.696290000000001 9.696290000000001 ZT20-23 9.764975 9.764975 9.764975