Table 3 Coefficient estimates for the group-based trajectory model.

From: Understanding the interplay between social isolation, age, and loneliness during the COVID-19 pandemic

Trajectory group

Parameters

Estimate

Standard error

p-value

1. Never lonely and stable

Intercept

− 2.34

0.72

.001

2. Rarely lonely and unstable

Intercept

1.95

0.47

< .001

Linear

− 0.12

0.03

< .001

Quadratic

0.00

0.00

< .001

3. Sometimes lonely and unstable

Intercept

5.04

0.24

< .001

Linear

− 0.19

0.04

< .001

Quadratic

0.01

0.00

< .001

Cubic

− 0.00

0.00

< .001

4. Often lonely and stable

Intercept

7.05

0.24

< .001

5. Always lonely and decreasing

Intercept

11.32

0.37

< .001

Linear

− 0.03

0.01

.011

Sigma

2.47

0.05

< .001

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