Effects of exposure to low-dose ionizing radiation on changing platelets: a prospective cohort study

Table 2 Multivariate Poisson regression analyses for the biennially changes in platelets

Variable	β (95% CI)	P	β^a(95% CI)	P^a
All	0.011 (0.006, 0.016)	< 0.001	0.008 (0.003, 0.014)	0.001
Gender
Male	0.012 (0.006, 0.018)	< 0.001	0.013 (0.007, 0.019)	< 0.001
Female	− 0.001 (− 0.010, 0.010)	0.955	− 0.002 (− 0.012, 0.008)	0.751
Age at baseline
< 40 years	0.009 (0.002, 0.015)	0.007	0.004 (− 0.003, 0.010)	0.262
≥ 40 years	0.023 (0.014,0.032)	< 0.001	0.020 (0.010, 0.029)	< 0.001
Service at baseline
< 10 years	0.027 (0.020, 0.033)	< 0.001	0.021 (0.014, 0.027)	< 0.001
≥ 10 years	− 0.014 (− 0.023, − 0.006)	0.001	− 0.015 (− 0.024, − 0.007)	< 0.001
Occupation
Physician	− 0.002 (− 0.008, 0.004)	0.530	− 0.002 (− 0.009, 0.004)	0.497
Radiation technician	0.047 (0.036, 0.059)	< 0.001	0.045 (0.033, 0.056)	< 0.001
Nurse	− 0.031 (− 0.048, − 0.015)	< 0.001	− 0.033 (− 0.049, − 0.016)	< 0.001
Others	0.043 (0.016, 0.069)	0.002	0.037 (0.008, 0.066)	0.012
Medical level
Primary	0.006 (− 0.007, 0.020)	0.336	0.015 (0.002, 0.029)	0.027
Secondary	0.017 (0.007, 0.026)	< 0.001	0.019 (0.010, 0.028)	< 0.001
Third	0.010 (0.003, 0.017)	0.004	0.004 (− 0.003, 0.011)	0.274
Smoking habits
No	0.007 (0.001, 0.013)	0.020	− 0.001 (− 0.007, 0.005)	0.838
Yes	0.025 (0.015, 0.035)	< 0.001	0.037 (0.026, 0.047)	< 0.001

^aEstimate based on Poisson regression model, adjusted for gender, age at baseline, service at baseline, occupation, medical level, and smoking habits

ISSN: 1347-4715