Table 4: Effects of low-dose UVA preirradiation on fibroblast DNA damage ( ).

GroupsThe percentage of DNA migration (%) valueAverage length of DNA migration (μm) value

SIG7.50 ± 1.2911.8 ± 3.49

HDG90.8 ± 4.35●●−36.41102 ± 29.4●●−11.98
ARG (J/cm2)7.282.5 ± 6.813.79488.4 ± 19.11.596
14.475.0 ± 2.9410.9777.3 ± 19.612.78
28.868.5 ± 3.87∆∆11.5265.3 ± 18.5∆∆14.38
57.657.9 ± 5.388.56849.3 ± 14.5∆∆16.76
115.251.0 ± 5.4810.9342.9 ± 11.4∆∆17.90

-test, compared with SIG, differences were extremely significant ●● ; compared with HDG, differences were extremely significant ∆∆ , and significant ; linear regression analysis of internal ARG, the percentage of DNA migration ( , , , and ) and average length of DNA migration ( , , , and ) were both close related to accumulated doses.
One-way ANOVA, the percentage of DNA migration, and the average length of DNA migration were no different among the ARG1 (7.2 J/cm2), ARG2 (14.4 J/cm2), and ARG3 (28.8 J/cm2), ; -test, there also was no difference between ARG4 (57.6 J/cm2) and ARG3 (115.2 J/cm2), .