Table 3 Multiple linear regression analysis: effects of air quality on ocular surface and tear cytokines.

From: The effects of short-term and long-term air pollution exposure on meibomian gland dysfunction

 

Age (per 1 year)

Temperature (per 1 °C)

Relative humidity (per 1%)

Wind speed (per 1 level)

PM2.5 (per 1 μg/m3)

PM10 (per 1 μg/m3)

O3 (per 1 μg/m3)

NO2 (per 1 μg/m3)

SO2 (per 1 μg/m3)

OSDI

0.003 (0.001 to 0.022)

0.049 (− 0.020 to 0.118)

− 0.101 (− 0.153 to − 0.050)*

− 0.868 (− 1.724 to − 0.013)

0.146 (0.094 to 0.198)**

0.118 (0.080 to 0.156)**

0.233 (0.179 to 0.353)*

0.063 (− 0.019 to 0.145)

0.137 (0.093 to 0.210)**

TMH

− 0.002 (− 0.002 to − 0.001)

0.003 (0.002 to 0.004)

0.000 (0.000 to 0.001)

0.012 (0.002 to 0.022)

− 0.074 (− 0.110 to − 0.012)*

− 0.005 (− 0.008 to − 0.003)

− 0.075 (− 0.127 to − 0.010)**

− 0.001 (− 0.002 to − 0.000)

0.005 (0.004 to 0.006)

ST

− 0.018 (− 0.050 to 0.013)

0.009 (− 0.019 to 0.037)

− 0.002 (− 0.021 to 0.016)

− 0.171 (− 0.477 to 0.136)

0.018 (0.000 to 0.027)

− 0.002 (− 0.017 to 0.013)

− 0.112 (− 0.145 to − 0.010)*

0.022 (− 0.011 to 0.054)

− 0.012 (− 0.047 to 0.023)

TBUT

− 0.013 (− 0.026 to 0.000)*

0.035 (0.019 to 0.051)**

0.000 (− 0.012 to 0.011)

− 0.426 (− 0.620 to − 0.232)

− 0.023 (− 0.032 to − 0.014)**

− 0.010 (− 0.022 to 0.002)

− 0.024 (− 0.039 to − 0.010)**

− 0.012 (− 0.031 to 0.006)

− 0.077 (− 0.092 to − 0.051)**

CFS

0.025 (0.017 to 0.033)

− 0.014 (− 0.024 to − 0.004)

− 0.018 (− 0.026 to − 0.011)

0.071 (− 0.055 to 0.196)

0.021 (0.013 to 0.028)**

0.012 (0.007 to 0.018)**

0.028 (0.018 to 0.039)**

0.004 (− 0.008 to 0.016)

0.089 (0.054 to 0.123)**

MG expression

0.014 (0.010 to 0.018)**

− 0.006 (− 0.011 to − 0.001)

− 0.004 (− 0.007 to 0.000)

− 0.035 (− 0.097 to 0.028)

0.007 (0.003 to 0.011)

0.003 (0.000 to 0.005)

0.008 (0.002 to 0.014)

0.003 (− 0.008 to 0.013)

0.004 (0.000 to 0.011)

MG secretion

0.029 (0.025 to 0.034)**

− 0.010 (− 0.016 to − 0.004)**

− 0.005 (− 0.009 to − 0.001)

0.130 (0.059 to 0.201)

0.000 (− 0.006 to 0.004)

0.002 (− 0.002 to 0.005)

0.006 (0.000 to 0.011)

0.001 (− 0.007 to 0.006)

0.020 (0.003 to 0.038)

MG loss

0.015 (0.010 to 0.020)**

− 0.009 (− 0.015 to − 0.003)

0.000 (− 0.004 to 0.005)

0.110 (0.036 to 0.185)

0.015 (0.011 to 0.020)**

0.007 (0.004 to 0.011)

0.015 (0.010 to 0.020)**

0.008 (− 0.007 to 0.020)

− 0.003 (− 0.011 to 0.005)

Conjunctivochalasis

0.025 (0.022 to 0.028)**

− 0.003 (− 0.007 to 0.001)

− 0.006 (− 0.009 to − 0.003)

− 0.006 (− 0.009 to − 0.003)

− 0.002 (− 0.005 to 0.001)

0.002 (− 0.001 to 0.004)

0.000 (− 0.002 to 0.002)

0.003 (− 0.002 to 0.008)

0.002 (− 0.003 to 0.007)

IL-1β

0.032 (− 0.019 to 0.083)

− 0.004 (− 0.102 to 0.094)

0.037 (− 0.009 to 0.083)

− 0.424 (− 1.073 to 0.226)

0.007 (− 0.009 to 0.024)

− 0.001 (− 0.005 to 0.002)

0.011 (0.000 to 0.022)*

0.007 (− 0.001 to 0.015)

− 0.044 (− 0.112 to 0.023)

IL-6

− 0.459 (− 1.956 to 1.038)

− 1.697 (− 4.980 to 1.585)

− 0.310 (− 1.847 to 1.227)

− 4.708 (− 6.327 to 6.912)

0.015 (0.001 to 0.028)*

0.018 (0.006 to 0.032)**

0.576 (0.386 to 0.702)**

0.396 (− 0.003 to 2.285)

− 0.003 (− 0.020 to 0.014)

IL-8

0.014 (0.005 to 0.022)

0.001 (− 0.015 to 0.016)

− 0.001 (− 0.008 to 0.006)

− 0.091 (− 0.194 to 0.013)

0.016 (0.004 to 0.029)**

0.005 (0.001 to 0.010)

0.479 (0.369 to 0.890)*

0.008 (0.001 to 0.017)

0.005 (− 0.010 to 0.024)

VEGF

0.010 (0.002 to 0.019)

− 0.008 (− 0.024 to 0.008)

0.004 (− 0.004 to 0.011)

0.042 (− 0.065 to 0.148)

0.012 (0.002 to 0.022)*

0.007 (− 0.002 to 0.012)

0.003 (0.001 to 0.007)

0.012 (0.003 to 0.022)*

0.021 (0.001 to 0.047)*

  1. PM particulate matter, O3 ozone, SO2 sulfur dioxide, NO2 nitrogen dioxide, OSDI ocular surface disease index, ST Schirmer’s I test, TMH tear meniscus height, TBUT tear film break-up time, CFS corneal fluorescein staining, MG meibomian gland, IL-1β interleukin 1 beta, IL-6 interleukin 6, IL-8 interleukin 8, VEGF vascular endothelial growth factor.
  2. The β (95% confidence interval) is shown for all significant correlations in bold.
  3. *P < 0.05, **P < 0.01.