Table 2 Model fit statistics and parameter estimates for distinct trajectories of erectile function (IIEF-5)
From: Progression of erectile function in men with chronic obstructive pulmonary disease: a cohort study
Group | n | AIC | BIC | Log- likelihood | Intercept (SE) | Linear slope (SE) | Quadratic slope (SE) |
|---|---|---|---|---|---|---|---|
1 | 185 | 2640.77 | 2648.82 | − 2635.77 | 11.685*** (0.605) | − 0.725*** (0.193) | 0.011 (0.161) |
2 | 107 | 2512.49 | 2528.59 | − 2502.49 | 7.515*** (0.671) | − 0.737** (0.197) | 0.143 (0.169) |
78 | 17.506*** (0.770) | −0.690* (0.235) | −0.278 (0.203) | ||||
3 | 86 | 2479.59 | 2503.74 | − 2464.59 | 6.018*** (0.697) | − 0.594** (0.206) | 0.126 (0.173) |
78 | 15.346*** (0.698) | −1.026*** (0.215) | −0.198 (0.183) | ||||
21 | 21.297*** (1.414) | −0.188 (0.411) | − 0.170 (0.325) | ||||
4 | 82 | 2461.49 | 2501.75 | − 2470.84 | 5.152*** (0.823) | − 0.395 (0.231) | −0.112 (0.180) |
17 | 16.300*** (2.090) | −2.260*** (0.716) | 2.438*** (0.523) | ||||
18 | 21.679*** (1.330) | −0.193 (0.410) | − 0.155 (0.311) | ||||
68 | 14.706*** (1.188) | −0.416 (0.392) | − 0.632** (0.223) | ||||
5 | 22 | 2470.84 | 2503.04 | − 2461.49 | 5.153** (2.345) | −0.395 (0.630) | −1.527*** (0.359) |
56 | 5.152*** (1.181) | − 0.395 (0.323) | − 0.079 (0.177) | ||||
36 | 16.300*** (2.101) | −2.260** (0.718) | 0.076 (0.305) | ||||
52 | 14.706*** (1.190) | −0.416 (0.393) | 2.377*** (0.458) | ||||
19 | 21.679*** (1.339) | −0.194 (0.411) | −0.146 (0.311) | ||||
Selected model Group name | n (%) | ||||||
Four group models | Group A: consistently good erectile function 18 (9.7) Group B: rapidly worsened and then rapidly improved 17 (9.2) Group C: gradually improved and then gradually worsened 68 (36.8) Group D: consistently poor erectile function 82 (44.3) | ||||||