Left: overlaid histograms of the orbital period distributions for planets in single-transiting systems (blue) and compact multiple planets (pink). We plot the median period of each sample as a solid vertical line of the respective color. The single-transiting planets have a median period of 6.29 days. The compact multiples have a median period of 8.04 days. Right: overlaid histograms of the orbital period distributions for planets with orbital periods less than 50 days. This panel contains 104 single-transiting planets and 133 planets from a compact multiple system. The median of the single-transiting systems is 4.81 days, while the median of the compact multiples is 7.88 days. In both panels, the compact multiples have a longer average orbital period. In Tables 16 and 17, we display the results of statistically testing the difference in the orbital period distributions. With a p-value of 4.41 × 10⁻⁵, we find that the orbital period distributions are significantly offset from each other.