The effect of the look-back period for estimating incidence using administrative data

Table 4 Comparison of the prediction models by RMSE and estimated R²

Model	Independent variable		intercept	Regression coefficient¹		RMSE	Adj R²
Model	X₁	X₂	intercept	ß₁	ß₂	RMSE	Adj R²
Uterine leiomyoma
A	Ln (Look-back)	Year	1	0.0967	0.01072	0.01297	0.9788
B	Ln (Look-back)	Patients size	0.1385	0.09757	0.00002347	0.01387	0.9757
C	Look-back	Year	−22.6134	0.0233	0.01141	0.03295	0.8632
D	Look-back	Patients size	0.14922	0.02358	0.00002459	0.03375	0.8565
Adenomyosis
A	Ln (Look-back)	Year	−46.7434	0.0464	0.02337	0.01371	0.9745
B	Ln (Look-back)	Patients size	−0.00698	0.04887	0.00017117	0.01637	0.9636
C	Look-back	Year	−47.0381	0.01154	0.02352	0.01877	0.9522
D	Look-back	Patients size	0.000494	0.01203	0.00017177	0.02195	0.9346
Endometriosis
A	Ln (Look-back)	Year	1.83882	0.0034	0.00091597	0.01762	0.9549
B	Ln (Look-back)	Patients size	−0.12183	0.0609	0.00047936	0.03409	0.8312
C	Look-back	Year	−43.6181	0.01176	0.02187	0.02229	0.9278
D	Look-back	Patients size	−0.10688	0.01539	0.0004722	0.03793	0.7911

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