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Table 2 Six-class LCA model of patterns of pedal cyclist injury

From: A taxonomy of childhood pedal cyclist injuries from latent class analysis: associations with factors pertinent to prevention

 

Polytrauma

Brain

Abdomen

Upper limb

Lower limb

Head

Estimated class probabilities

0.06

0.09

0.17

0.20

0.12

0.37

Predicted class membership (%)

5.5

9.0

11.0

20.9

12.4

41.2

Major brain

0.32

1.00

0.01

0.00

0.00

0.00

Minor brain

0.26

0.00

0.02

0.00

0.02

0.53

Skull fracture

0.26

0.40

0.00

0.00

0.00

0.07

Face fracture

0.39

0.16

0.02

0.01

0.00

0.23

Chest visceral

0.57

0.02

0.06

0.01

0.01

0.01

Abdominal visceral

0.31

0.00

0.55

0.00

0.02

0.01

Spinal cord

0.03

0.00

0.00

0.00

0.00

0.00

Vertebral

0.24

0.01

0.03

0.00

0.01

0.02

Upper limb

0.37

0.06

0.04

1.00

0.06

0.09

Lower limb

0.47

0.03

0.00

0.00

1.00

0.04

High injury number

0.99

0.28

0.01

0.01

0.05

0.15

  1. ‘Estimated class probabilities’ refers to the model-estimated probability that a randomly selected casualty belongs in one or another latent class. The model also calculates for each individual casualty a probability of membership in each class. The modal probability of class membership determines class membership for further analysis. ‘Predicted class membership’ indicates the fraction of casualties assigned to each latent class. Finally, the model estimates probabilities of the various injures conditional on class membership