Table 2.

Multinomial logistic regression models for correlates of neck pain

Variables/NPQ	Low	Medium			High			p Value for trend*
		OR	95% CI	p Value	OR	95% CI	p Value
Total participants
Age (years)	Ref.	0.97	0.92 to 1.02	0.18	0.99	0.94 to 1.04	0.768	0.541
BMI (kg/m2)	Ref.	1.01	0.93 to 1.10	0.80	1.01	0.92 to 1.10	0.901	0.868
Male	Ref.	0.60	0.35 to 1.03	0.06	0.36	0.20 to 0.64	0.001	0.000
Bachelor or more	Ref.	0.90	0.52 to 1.58	0.72	0.69	0.39 to 1.22	0.201	0.344
Married	Ref.	0.66	0.35 to 1.26	0.21	1.20	0.61 to 2.36	0.604	0.425
Neck injury	Ref.	7.88	0.85 to 73.31	0.07	9.61	1.06 to 87.52	0.045	0.006
Work years ≥5 years	Ref.	2.01	1.04 to 3.88	0.04	1.76	0.88 to 3.53	0.110	0.088
Cold office temperature	Ref.	1.05	0.46 to 2.38	0.92	1.87	0.85 to 4.14	0.122	0.011
Computer displayer not in front	Ref.	1.41	0.84 to 2.35	0.19	1.99	1.17 to 3.40	0.011	0.001
Computer use ≥8 hours/day	Ref.	1.27	0.78 to 2.06	0.35	1.02	0.61 to 1.70	0.956	0.561
Male
Age (years)	Ref.	1.02	0.95 to 1.09	0.631	0.95	0.88 to 1.03	0.183	0.649
BMI (kg/m2)	Ref.	1.02	0.90 to 1.16	0.770	0.98	0.86 to 1.11	0.707	0.570
Bachelor or more	Ref.	1.51	0.62 to 3.66	0.360	0.62	0.25 to 1.56	0.313	0.539
Married	Ref.	0.52	0.19 to 1.43	0.206	1.02	0.34 to 3.06	0.974	0.574
Neck injury	Ref.	7.51	0.74 to 75.67	0.087	7.98	0.67 to 94.35	0.100	0.013
Work years ≥5 years	Ref.	1.15	0.42 to 8.30	0.783	2.67	0.87 to 8.19	0.087	0.140
Cold office temperature	Ref.	2.02	0.49 to 8.30	0.332	1.12	0.21 to 5.86	0.898	0.791
Computer displayer not in front	Ref.	0.66	0.30 to 1.47	0.311	1.43	0.60 to 3.39	0.416	0.281
Computer use ≥8 hours/day	Ref.	1.24	0.59 to 2.60	0.573	0.53	0.22 to 1.30	0.168	0.078
Female†
Age (years)	Ref.	0.94	0.86 to 1.02	0.112	1.03	0.95 to 1.11	0.509	0.150
BMI (kg/m2)	Ref.	1.01	0.90 to 1.13	0.889	1.03	0.91 to 1.16	0.673	0.420
Bachelor or more	Ref.	0.66	0.31 to 1.43	0.295	0.58	0.27 to 1.26	0.169	0.365
Married	Ref.	0.81	0.34 to 1.97	0.645	1.41	0.58 to 3.44	0.447	0.168
Work years ≥5 years	Ref.	2.71	1.05 to 6.96	0.039	1.52	0.59 to 3.93	0.385	0.378
Cold office temperature	Ref.	0.79	0.28 to 2.24	0.653	2.06	0.80 to 5.31	0.135	0.010
Computer displayer not in front	Ref.	2.59	1.26 to 5.34	0.010	2.94	1.41 to 6.11	0.004	0.001
Computer use ≥8 hours/day	Ref.	1.39	0.70 to 2.66	0.356	1.36	0.70 to 2.67	0.367	0.714

 *The p values for trend were obtained from multiple linear regression models.

†The variable of neck injury was excluded from the female regression model because there were no participants in the low NPQ tertile.

BMI , body mass index: NPQ, Northwick Park Neck Pain Questionnaire.