Pulmonary effects of exposure to indium and its compounds: cross-sectional survey of exposed workers and experimental findings in rodents

Table 5 General characteristics and serum SP-A of subjects in three subgroups

Characteristic	Group1 (n = 23) < 4 year	Group2 (n = 17) 4–10 year	Group3 (n = 17) > 10 year	P
Age (years)^a	29.00 (26.00–39.00)	32.00 (28.00–45.00)	43.00 (40.00–48.00)	0.007^e
Sex n (%)^b				0.538
Male	15 (65.22)	12 (70.59)	14 (82.35)
Female	8 (34.78)	5 (29.41)	3 (17.65)
BMI (kg/m²)^c	25.04 ± 5.92	24.31 ± 6.10	23.97 ± 5.20	0.835
Smoking n (%)^b				0.869
Yes	8 (34.78)	6 (35.29)	7 (41.18)
No	15 (65.22)	11 (64.71)	10 (58.82)
Drinking n (%)^b				0.400
Yes	8 (34.78)	7 (41.18)	3 (17.65)
No	15 (65.22)	10 (58.82)	14 (82.35)
Job duration (years)^a	2.00 (1.00–3.00)	7.00 (5.00–8.50)	20.00 (15.00–22.00)	< 0.001^e
SP-A (μg/L)^d	103.43 (73.68–164.85)	128.65 (76.70–176.89)	218.45 (94.57–459.95)	0.011^e

^aData represent P₅₀ (P₂₅–P₇₅) and P value was calculated by Kruskal–Wallis H test
^bCalculated by Chi square test
^cData were expressed as mean ± SD and P value was calculated by One-way variance (ANOVA) with LSD or Dunnett’s T3 tests
^dData represent P₅₀ (P₂₅–P₇₅) and multiple linear regression analysis was used to compare values between subgroups after adjusting for age, sex, BMI, smoking, and drinking status
^eSignificant difference between subgroups (P < 0.05)

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