**Table 3:** Impact of bar class on CO abundance.
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
Database	Class	Total	Det.	Undet.	Mean I₁₀	$\sigma$ (I₁₀)	median M_B
					[ $\>{\rm K}~{\rm km}~{\rm s}^{-1}$ ]	[ $\>{\rm K}~{\rm km}~{\rm s}^{-1}$ ]
	unbarred (SA)	16	7	9	1.13	0.83	-17.3
RC3	mixed (SAB)	16	11	5	1.56	1.50	-18.2
	barred (SB)	15	12	3	1.80	1.80	-18.4
	full sample	47	30	17	1.49	1.42	-17.8
	unbarred	12	7	5	1.30	0.90	-17.3
LEDA	barred	35	23	12	1.56	1.57	-18.2
	full sample	47	30	17	1.49	1.42	-17.8

Column 7: standard deviation of I₁₀ values, including upper limits.

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