Column density ratios of six O-COMs with respect to methanol versus bolometric luminosity. Panels from left to right and top to bottom: dimethyl ether (DME; CH₃OCH₃), methyl formate (MF; CH₃OCHO), ethanol (C₂H₅OH), acetaldehyde (CH₃CHO), glycolaldehyde (GA; CH₂OHCHO), and ethylene glycol (EG; (CH₂OH)₂). The red points show the CoCCoA data of 14 high-mass sources derived in this work, and the blue points show the literature data of five low-mass sources: IRAS 16293-2242 A & B (Manigand et al. 2020; Jørgensen et al. 2018), S68N, B1c, and B1-bS (van Gelder et al. 2020). Upper limits are denoted by downward triangles. The data points of NGC 6334-38 and NGC 6334-43 are denoted by leftward triangles due to their upper limits on luminosity. The solid line in gray corresponds to the mean column density ratio of each species, and the gray shaded area shows the standard deviation weighted by the uncertainty on log scales. The mean and standard deviation were calculated from both the high-mass sources and the low-mass ones. The dashed and dotted lines in black correspond to the modeled COM ratios at the end of the cold collapse stage (stage 1) and the warm-up stage (stage 2) in G22, respectively.