Table 2.

Propensity Score Matching

	Mean before matching			Mean after matching
	CU+ Group (n = 519)	CU− Group (n = 8,880)	SMD	CU+ Group (ESS = 519, n = 519)	CU− Group (ESS = 820.6, n = 8,880)	SMD
Distance	0.153	0.050	0.712	0.153	0.153	0.000
Mean maternal age, y	30.573	31.979	−0.291	30.57	30.595	−0.005
Ethnicity
Biracial	0.027	0.025	0.010	0.027	0.028	−0.007
Black	0.012	0.012	−0.002	0.012	0.010	0.018
East or Southeast Asian	0.017	0.033	−0.122	0.017	0.010	0.060
Hispanic	0.017	0.019	−0.016	0.017	0.021	−0.028
Indigenous	0.077	0.024	0.198	0.077	0.065	0.046
South Asian	0.004	0.028	−0.987	0.004	0.005	−0.017
West Asian	0.004	0.011	−0.109	0.004	0.002	0.029
White	0.842	0.848	−0.015	0.842	0.860	−0.049
Income, CAD
<$70,000	0.459	0.192	0.535	0.459	0.441	0.035
$70,000-$99,999	0.195	0.197	−0.007	0.195	0.213	−0.047
$100,000-$124,999	0.139	0.192	−0.154	0.139	0.153	−0.041
$125,000-$174,999	0.146	0.249	−0.290	0.146	0.149	−0.008
≥$175,000	0.062	0.170	−0.449	0.062	0.043	0.076
Relationship status
Marriage-like	0.484	0.322	0.324	0.484	0.509	−0.051
Married	0.407	0.639	−0.474	0.407	0.377	0.060
Single	0.110	0.039	0.226	0.110	0.114	−0.013
Symptoms of depression
Clinically elevated	0.547	0.321	0.455	0.547	0.535	0.025
Not elevated	0.453	0.679	−0.455	0.453	0.465	−0.025
Symptoms of anxiety
Clinically severe	0.143	0.065	0.221	0.143	0.116	0.076
Clinically moderate	0.516	0.394	0.244	0.516	0.522	−0.012
Clinically mild	0.125	0.214	−0.269	0.125	0.123	0.006
Not elevated	0.216	0.326	−0.268	0.216	0.238	−0.055
Alcohol use during pregnancy	0.299	0.118	0.394	0.299	0.303	−0.010
Tobacco use during pregnancy	0.281	0.041	0.535	0.281	0.286	−0.010
Child sexa
Female	0.224	0.290	−0.067	0.224	0.227	−0.003
Male	0.260	0.316	−0.056	0.260	0.264	−0.004
Other	0.002	0.000	0.002	0.002	0.000	0.002
Not reported	0.514	0.393	0.121	0.514	0.509	0.005
COVID-19 infectiona
Confirmed negative	0.073	0.095	−0.022	0.073	0.076	−0.003
Confirmed positive	0.004	0.005	−0.001	0.004	0.001	0.003
Not reported	0.923	0.900	0.023	0.923	0.923	0.000

Note: CU+ = Participants who reported cannabis use during pregnancy; CU− = participants who did not report cannabis use during pregnancy; ESS = effective sample size; SMD = standard mean difference.

^aParticipants were not matched on this variable.