. 2024 Mar 18;9(1):2364. doi: 10.23889/ijpds.v9i1.2364

Table 3: Comparison of outcomes in full linked cohort: Agreement between CIHI-DAD and BIS for parity, gestational age at birth (in weeks), and infant birthweight (among singleton livebirth deliveries).

Condition	Mean (SD)		Mean (SD) difference DAD - BIS	Percent agreement (%)				Weighted Kappa coefficient (95% CI)
Condition	DAD	BIS	Mean (SD) difference DAD - BIS	Exact	±1	±2	≥±3	Weighted Kappa coefficient (95% CI)
Parity	0.89 (1.1)^a	0.91 (1.1)^b	-0.02 (0.32)^c	94.7%^c	4.6%^c	0.5%^c	0.02%^c	0.940 (0.940 to 0.941)^c
Gestational age at birth (in weeks)	38.7 (2.0)	38.8 (2.1)	‒0.01 (0.50)	89.3%	9.4%	0.8%	0.5%	0.929 (0.929 to 0.930)
				Difference in grams (%)				Intra-class coefficient
				Exact	±1 to 500	±501 to 1000	±1001±
Birthweight (in grams)	3366.0 (552.2)^d	3365.8 (564.6)^e	1.0 (149.2)^f	95.8%^f	3.8%^f	0.3%^f	0.1%^f	0.031

^aLimited to 777,933 non-missing parity in CIHI-DAD.

^bLimited to 768,620 non-missing parity in BIS.

^cLimited to 768,575 non-missing parity on both CIHI-DAD and BIS linked records.

^dLimited to 760,034 liveborn deliveries with recorded birthweight in CIHI-DAD.

^eLimited to 760,534 liveborn deliveries with recorded birthweight in BIS.

^fFurther limited to 756,119 liveborn deliveries with recorded birthweight in both CIHI-DAD and BIS.