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Table 1 Estimates of the parameters for the broken-stick model for each trajectory group

From: Trajectories of a set of ten functional somatic symptoms from adolescence to middle age

Group

Par.

Breath.

Dizzi.

Fatigue

Head.

Nausea

Overst.

Palpi.

Sleep.

Stomach

Back

Healing

b0

3.919*

3.405*

4.647*

3.850*

5.772*

0.373

−0.646

2.836*

5.452*

−1.119

b1

0.194

−1.149*

−0.540*

−0.723*

0.395*

−0.184

−1.238*

−0.221

0.032

−0.062

b2

−0.318*

−0.230*

−0.207*

−0.124*

−0.306*

−0.098

−0.095

−0.186*

−0.325*

0.036

b3

0.322*

0.182*

0.191*

0.120*

0.258*

0.058

0.100

0.211*

0.299*

−0.010

Low

b0

2.340

1.958

2.094*

−0.792

3.276*

−2.897

−1.072

−0.397

4.236*

−1.981*

b1

−0.381

−0.850*

−0.593*

−0.700*

0.237

−0.543

−1.243

−0.494*

−0.482

0.079

b2

−0.279*

−0.265*

−0.154*

0.024

−0.276*

0.008

−0.145

−0.048

−0.363*

0.012

b3

0.319*

0.293*

0.188*

0.014

0.271*

−0.006

0.117

0.074

0.410*

0.028

High

b0

−0.301

0.781

4.744*

−0.565

3.409*

−1.538

−2.214*

1.642

2.801*

−1.192

b1

−0.040

−0.510*

−0.422

−1.583*

−0.774*

0.388*

−0.582*

0.474*

−0.226

−0.159

b2

−0.011

−0.050

−0.165*

0.152*

−0.110*

0.030

0.065

−0.071

−0.144*

0.082

b3

0.030

0.083

0.222*

−0.110

0.098

0.007

−0.045

0.101

0.164*

−0.030

Increase

b0

−2.670*

−2.472

−0.453

−2.970*

−1.767

−2.925*

−4.206*

−0.824

−0.739

−6.335*

b1

−0.047

−0.785*

−0.712*

−1.059*

−0.705*

−0.322

−0.916*

0.068

−0.190

−0.234

b2

0.027

0.026

0.047

0.189*

0.053

0.065

0.095

−0.001

−0.041

0.285*

b3

0.038

0.043

0.052

−0.151*

−0.022

−0.014

−0.031

0.085

0.103

−0.226*

  1. Estimates for the male gender (difference from females) are denoted by b1
  2. Coefficient b2 is the regression coefficient for age period (16, 21) and b2 and b3 jointly are coefficient estimates for the age period [21, 42]
  3. Statistically significant estimates (at 5% level of significance) are marked with an asterisk