Effects of ENSO on Autumn Rainfall in Central Vietnam

Table 4

The probability ( value) associated with Student’s -test for El Niño, La Niña, and ENSO-neutral conditions compared to climatology for rainfall, relative vorticity, and sea level pressure. Columns 4 and 5 indicate the statistical significance at 95% and 90% confidence levels, respectively. A YES means that the difference between mean values in an ENSO condition and climatology is statistically significant.

Variables	Condition	value	95% level	90% level
Regional average rainfall	El Niño	0.007	YES	YES
	La Niña	0.100	no	YES
	Neutral	0.146	no	no
Relative vorticity at 10 m level	El Niño	0.013	YES	YES
	La Niña	0.019	YES	YES
	Neutral	0.465	no	no
Relative vorticity at 850 hPa level	El Niño	0.019	YES	YES
	La Niña	0.022	YES	YES
	Neutral	0.491	no	no
Sea level pressure	El Niño	0.009	YES	YES
	La Niña	0.021	YES	YES
	Neutral	0.346	no	no