Table 2: Effects of low-dose UVA on fibroblast cell cycle (%, ).

Group/cell cycles

SIG

LDG (J/cm^{2})

7.2^{a}

14.4^{b}

28.8^{c}

57.6^{d}

115.2^{e}

G0/G1

83.4 ± 1.01

84.4 ± 0.65

84.6 ± 0.36

84.4 ± 1.59

92.7 ± 0.97^{∆}

93.9 ± 0.63^{∆}

S

9.08 ± 0.28

10.7 ± 0.72^{∆}

12.3 ± 0.91^{∆}

13.1 ± 1.09^{∆}

6.30 ± 1.07^{∆}

4.90 ± 0.65^{∆}

G2 + M

6.63 ± 0.89

4.18 ± 0.38^{∆}

2.60 ± 0.55^{∆}

1.68 ± 0.37^{∆}

0.73 ± 0.28^{∆}

0.63 ± 0.22^{∆}

, compared with SIG, proportion of G0/G1 phase, S phase, and G2/M phase of fibroblasts of each LDG differences were extremely significant ( were −3.440, 3.280, were −9.662, 7.319, were −4.025, 9.316, were −5.788, 10.78, 23.44, were −7.461, 10.58, 4.869); linear regression analysis, the cell cycle distribution of the low-dose group were closely related to cumulative doses of UVA irradiation, respectively, , , . One-way ANOVA, the proportions of respective phases of cell cycle showed no difference among the 7.2 J/cm^{2}, 14.4 J/cm^{2}, and 28.8 J/cm^{2} dosages, ; The -test also showed no difference between the dosages of 57.6 J/cm^{2} and 115.2 J/cm^{2}, .