Table 2 Daily air pollution levels in Haikou (ppb)
From: Ambient air pollution and birth defects in Haikou city, Hainan province
Air pollutants | Year | N | Mean | SD | 95% CI | F | P | |
|---|---|---|---|---|---|---|---|---|
Lower | Upper | |||||||
NO2 | 2009 | 365 | 15.88 | 4.75 | 15.39 | 16.37 | 0.638 | 0.529 |
2010 | 365 | 15.43 | 6.14 | 14.80 | 16.06 | |||
2011 | 365 | 15.74 | 5.60 | 15.16 | 16.32 | |||
PM10 | 2009 | 365 | 38.38 | 15.41 | 36.79 | 39.96 | 1.510 | 0.221 |
2010 | 365 | 40.17 | 21.19 | 37.99 | 42.35 | |||
2011 | 365 | 40.62 | 18.35 | 38.73 | 42.51 | |||
SO2 | 2009 | 365 | 7.03 | 3.91 | 6.63 | 7.43 | 9.753 | <0.0001 |
2010 | 365 | 6.72 | 3.58 | 6.35 | 7.09 | |||
2011 | 365 | 7.94 | 4.17 | 7.51 | 8.37 | |||