Table 2. Point prevalence of LBP as stratified by personal factors, farming characteristics, and stress level (n = 344).

Demographic characteristic	Total	Prevalence (%) of LBP	95% CI
Overall	344	83.1	78.8–86.9
Gender
Male	151	80.8	70.4–84.9
Female	193	85.0	79.1–89.7
Age
≤ 45 years old	173	86.1	80.1–90.9
> 45 years old	171	80.1	73.3–85.8
Farming experience
< 25 years	151	86.7	80.3–91.7
≥ 25 years	193	80.3	74.0–85.7
Number of working days
≤ 5 days	178	86.5	80.6–91.2
> 5 days	166	79.5	72.5–85.4
Number of bundles
< 45 bundles	197	83.8	77.9–88.6
≥ 45 bundles	147	82.3	75.2–88.1
Weight of a bundle
< 2 kg	308	82.1	77.4–86.2
≥ 2 kg	36	91.7	77.5–98.2
Hours transplanting per day
< 7 hr/day	167	85.0	78.7–90.1
≥ 7 hr/day	177	81.4	74.8–86.8
Level of stress*
Mild or moderate	191	78.5	72.0–84.1
High or severe	153	88.9	82.8–93.4

* Statistically significant (p-value <0.05)