Increase of chronic low back pain prevalence in a medium-sized city of southern Brazil

Table 4 Association of demographic, socioeconomic, behavioral, nutritional and workloads with chronic low back pain in 2010

Variable		Crude analyses			Adjusted analyses
Variable	PRR	95% CI^†	P	PRR	95% CI^†	P
1 ^st Level
Sex			<0,001^*			<0,001^*
Male	1	-		1	-
Female	1.77	1.38-2.26		1.76	1.38-2.23
Age			<0,001^**			<0,001^**
20-29	1	-		1	-
30-39	1.96	1.19-3.22		1.96	1.20-3.21
40-49	2.79	1.74-4.48		2.83	1.75-4.57
50-59	3.23	1.99-5.25		3.24	1.99-5.25
60-69	3.35	2.20-5.12		3.35	2.19-5.13
70 or older	3.32	2.11-5.23		3.15	2.00-4.97
Skin Color			0,3^*			-
White	1	-		-	-
Non White	1.18	0.89-1.56		-	-
2 ^nd Level
Civil Status			0,04^*			0,02^*
Single/alone	1	-		1	-
Married/partner	1.29	1.01-1.64		1.31	1.03-1.65
Education (y)			<0,001^**			0,01^**
0	2.11	1.36-3.28		1.55	1.00-2.41
1-4	1.92	1.37-2.68		1.46	1.03-2.07
5-8	1.44	0.98-2.10		1.21	0.82-1.78
9-11	1.19	0.78-1.81		1.20	0.79-1.83
12 or more	1	-		1	-
3 ^rd Level
Smoking			0,003^**			0,005^**
Never smoker	1	-		1	-
Former smoker	1.41	1.05-1.90		1.23	0.90-1.69
Current smoker	1.43	1.11-1.85		1.48	1.12-1.97
BMI			<0,001^**			0,01^**
<25	1	-		1	-
Overweight (25–29.9)	1.13	0.84-1.51		0.96	0.70-1.33
Obesity (≥30)	1.91	1.43-2.53		1.50	1.12-2.01
4 ^th Level
Insufficient Physical Activity			0.10^*			0.90^*
No	1	-		1	-
Yes	1.30	0.95-1.79		1.02	0.74-1.43
Repetitiviness			<0,001^**			0,01^**
Never	1	-		1	-
Sometimes	1.51	0.97-2.35		1.47	0.89-2.41
Always	2.05	1.38-3.05		1.70	1.09-2.64
Weight lifting/loading			0,03^**			0,73^**
Never	1	-		1	-
Sometimes	1.04	0.77-1.40		0.98	0.74-1.30
Always	1.38	1.05-1.81		1.07	0.80-1.42
Forced/Akward position			<0,001^**			<0,001^**
Never	1	-		1	-
Sometimes	1.31	0.93-1.84		1.24	0.87-1.77
Always	2.17	1.60-2.95		1.90	1.37-2.63
Static Posture			0,15^**			0,70^**
Never	1	-		1	-
Sometimes	1.29	0.96-1.73		1.04	0.77-1.40
Always	1.27	0.92-1.77		0.94	0.66-1.36

^* Wald Test for Heterogeneity.
^** Wald Test for Trend.
^† 95% Confidence Interval.
1st Level: adjusted between them; 2nd Level: adjusted between them and for the variables from the 1st level; 3rd Level: adjusted between them, for the ones from 1st and 2nd levels; 4th Level: adjusted between them and for previous levels.

ISSN: 1471-2474