Table 3.

AUC for GOLD 2007, GOLD 2011, and GOLD 2017 at 20 Years of Follow-Up Among Participants with COPD Aged ≥40 Years in the HUNT2 Study (N=1300)

Outcomes	GOLD 2007 ¶	GOLD >2011 ¥	GOLD 2017 †
AUC (95% CI) *	AUC (95% CI) *	AUC (95% CI) *
COPD hospitalization	63.1 (58.7–66.9)	60.9 (56.1–64.4)	56.1 (54.0–58.1)
All-cause mortality	57.0 (54.8–59.1)	54.1 (52.1–56.0)	52.6 (51.0–54.3)

Notes: *Model 1 (crude model) - the Cox model included GOLD 2007, GOLD 2011, or GOLD 2017. ^¶Grade 1 – percent-predicted forced expiratory volume in first second (ppFEV₁) ≥80; grade 2 –80>ppFEV₁≥50; grade 3 –50>ppFEV₁≥30; grade 4 –ppFEV₁<30. ^¥Group A – ppFEV₁≥50 and exacerbation history <2 and modified Medical Research Council dyspnea scale (mMRC) <2; group B – ppFEV₁≥50 and exacerbation history <2 and mMRC ≥2; group C – ppFEV₁<50 or exacerbation history ≥2 and mMRC <2; group D – ppFEV₁<50 or exacerbation history ≥2 and mMRC ≥2. ^†Group A – mMRC <2 & exacerbation history <2; group B – mMRC ≥2 & exacerbation history <2; group C – mMRC <2 & exacerbation history ≥2; group D – mMRC ≥2 & exacerbation history ≥2.

Abbreviation: HUNT2, Nord-Trøndelag Health Study 1995–1997; AUC, area under receiver operating characteristics curves.