condition mean min max ZT0-3 19.23845 19.11935 19.35755 ZT4-7 36.4746 36.4746 36.4746 ZT8-11 39.59975 39.59975 39.59975 ZT12-15 0 0 0 ZT16-19 35.08735 35.08735 35.08735 ZT20-23 38.66395 38.66395 38.66395