Table 2.
Weighted Prevalence of low back pain in different basic and demographic groups.
| Variable | Prevalence of low back pain, number (%) | 95% Confidence Interval |
|---|---|---|
| Sexb | ||
| Male | 14795 (21.2) | 16.7–26.7 |
| Female | 26250 (30.3) | 23.7–37.9 |
| Age (year)b | ||
| 35–44 | 12302 (21.4) | 16.8–26.8 |
| 45–54 | 14756 (27.8) | 22.2–34.2 |
| 55–64 | 11099 (30.4) | 23.9–37.8 |
| >65 | 2888 (30.8) | 23.4–39.4 |
| BMI (Kg/m2)b | ||
| Underweight | 495 (15.1) | 11.6–19.4 |
| Normal | 8750 (21.7) | 16.3–28.1 |
| Overweight | 16498 (25.5) | 20.3–31.5 |
| Obese | 15154 (30.2) | 24.4–36.7 |
| Ethnicityb | ||
| Fars | 10855 (22.5) | 17.2–28.8 |
| Azari | 10040 (25.4) | 21.6–29.5 |
| Balouch | 607 (18.8) | 16.8–20.9 |
| Kurd | 4275 (28.0) | 22.7–34.0 |
| Lor | 1323 (16.5) | 15.3–17.9 |
| Arab | 3116 (30.2) | 26.3–34.2 |
| Zaboli | 1068 (18.5) | 18.5–18.6 |
| Gilak | 2652 (27.9) | 27.0–28.8 |
| Turk nomad | 914 (18.4) | 17.1–19.8 |
| Arab nomad | 1047 (25.2) | 14.3–40.4 |
| Mazani | 4115 (42.0) | 41.9–42.1 |
| Mixed | 1033 (25.2) | 19.0–32.7 |
| Living areab | ||
| Urban | 29255 (24.9) | 19.9–30.5 |
| Rural | 11790 (28.6) | 21.1–37.5 |
| Educationb | ||
| Illiterate | 10180 (32.5) | 25.2–40.8 |
| Primary school | 13455 (27.3) | 22.0–33.4 |
| Guidance school | 5306 (23.9) | 18.2–30.7 |
| High school | 7990 (23.5) | 18.4–29.4 |
| University | 4106 (22.0) | 16.2–29.1 |
| Employment statusb | ||
| Employed | 15053 (21.4) | 16.5–27.3 |
| Unemployed | 6195 (27.4) | 20.8–35.1 |
| Housewife | 17678 (31.5) | 23.8–40.4 |
| Retired | 2119 (26.5) | 21.1–32.8 |
| Smoking historyb | ||
| Smoker | 5173 (23.4) | 19.1–28.4 |
| Non smoker | 32813 (26.2) | 20.4–33.0 |
| former | 3041 (24.9) | 19.4–31.3 |
| Physical activity (MET)a | ||
| low | 14440 (25.6) | 20.9–31.0 |
| medium | 13739 (25.4) | 20.3–31.3 |
| high | 12866 (26.0) | 19.5–33.8 |
| Socioeconomic Statusb | ||
| 1st quintile | 8698 (28.3) | 19.8–38.8 |
| 2nd quintile | 8635 (25.8) | 20.2–32.3 |
| 3rd quintile | 8192 (24.8) | 20.4–29.8 |
| 4th quintile | 8989 (25.9) | 20.8–31.9 |
| 5th quintile | 6447 (24.4) | 19.2–30.6 |
| Marital statusb | ||
| Single | 4022 (28.5) | 22.6–35.3 |
| Married | 37023 (25.5) | 20.1–31.8 |
| Morning stiffness in jointb | ||
| Positive | 5574 (54.0) | 43.3–64.3 |
| Negative | 35470 (24.2) | 18.9–30.3 |
| Joint painb | ||
| Positive | 27968 (35.5) | 28.3–43.4 |
| Negative | 13077 (16.1) | 11.9–21.5 |
| Sleep durationb | ||
| Short | 6251 (27.5) | 20.5–35.8 |
| Normal | 25725 (25.0) | 19.6–31.3 |
| Long | 8970 (26.8) | 22.0–32.1 |
a
P-value < 0.05.
b
P-value < 0.0001.