Table 1

Data used for calculation of point score system

	Proportion of patients in each category	β	W and W_ref for each category	Regression unit for each category	Point score
eGFR*		−0.012
>90 mL/min	0.014		105 mL/min=W_ref		0
60–89 mL/min	0.128		74.5 mL/min	0.397	1
30–59 mL/min	0.552		54.5 mL/min	0.787	2
<30 mL/min	0.307		17.5 mL/min	1.138	3
Social support
Living alone or with spouse	0.818	0.481	0=W_ref	0	0
Nursing home	0.182		1	0.481	1
Pulmonary disease†		0.607
No	0.878		0=W_ref	0	0
Yes	0.122		1	0.607	2
Malignant disease‡		0.506
No	0.834		0=W_ref	0	0
Yes	0.166		1	0.506	1
Prescription of drug for peptic ulcer and GERD		0.362
No	0.674		0=W_ref	0	0
Yes	0.326		1	0.362	1
Prescription of opioid drug		0.724
No	0.821		0=W_ref	0	0
Yes	0.179		1	0.724	2
Prescription of non-TCA-antidepressant drug		−0.558
No	0.791		0=W_ref	0	0
Yes	0.209		1	−0.558	−2
The average 1-year event-free rate=0.3215§

Regression unit for each category=β(W−W_ref).
Point score=β(W−W_ref)/B.
*Cockroft-Gault formula eGFR.
†Asthma or COPD.
‡Past or present.
§The Kaplan–Meier estimate of the event-free rate at the mean values of the risk factors.
COPD, chronic obstructive pulmonary disease; eGFR, estimated glomerular filtration rate; GERD, gastroesophageal reflux disease; TCA, tricyclic antidepressant.