condition mean min max ZT0-3 12.518486 12.518486 12.518486 ZT4-7 16.761794000000002 16.761794000000002 16.761794000000002 ZT8-11 14.50114 14.50114 14.50114 ZT12-15 15.0546455 15.0546455 15.0546455 ZT16-19 12.0879105 12.0879105 12.0879105 ZT20-23 14.729471499999999 14.729471499999999 14.729471499999999