Table 3.

Risk of injury stratified by subgroup of spinal curvature disorders

Spinal curvature disorders	Crude HR (95% CI)	Adjusted HR* (95% CI)
Kyphosis
With	1.579	2.777 (2.553 to 3.021)***
Without	1 (Reference)	1 (Reference)
Lordosis
With	1.033	2.087 (1.235 to 3.527)†
Without	1 (Reference)	1 (Reference)
Kyphoscoliosis and scoliosis
With	1.146	2.113 (2.201 to 2.210)***
Without	1 (Reference)	1 (Reference)
Unspecified
With	1.388	2.727 (2.119 to 3.509)***
Without	1 (Reference)	1 (Reference)

***P<0.001.

ICD-9-CM code: kyphosis (ICD-9-CM 737.0, 737.1, 737.41), lordosis (ICD-9-CM 737.2, 737.42), kyphoscoliosis and scoliosis (ICD-9-CM 737.3, 737.43), and unspecified (ICD-9-CM 737.40, 737.8, 737.9).

*Adjusted HR: multivariable analysis including gender, age, comorbidities, urbanisation level and insurance premium.

†P=0.006.

ICD-9-CM, International Classification of Diseases, Ninth Revision, Clinical Modification.