condition mean min max ZT0-3 55.0095 33.59575 76.42325 ZT4-7 38.07705 38.07705 38.07705 ZT8-11 49.61935 49.61935 49.61935 ZT12-15 0 0 0 ZT16-19 38.72115 38.72115 38.72115 ZT20-23 28.88905 28.88905 28.88905