condition mean min max ZT0-3 932.422958 932.422958 932.422958 ZT4-7 1200.8209605000002 1200.8209605000002 1200.8209605000002 ZT8-11 1613.671602 1613.671602 1613.671602 ZT12-15 1349.299599 1349.299599 1349.299599 ZT16-19 841.798544 841.798544 841.798544 ZT20-23 1029.3791765 1029.3791765 1029.3791765