Table 1.

The linear trends, confident interval and significance of the DSL and DSE for the periods 1979–2011 and 1979–2005

Data	DSL	DSE
PM (1979–2011)	1.3 ± 0.5 pen/dec	0.9 ± 0.4 pen/dec
	8.0 ± 2.5 d/dec	4.5 ± 2.0 d/dec
PM(1979–2005)	2.8 ± 0.6 pen/dec	2.3 ± 0.4 pen/dec
	14.0 ± 3.0 d/dec	11.5 ± 2.0 d/dec

Uncertainty less than 5% (P < 5%) as determined by the two-tailed t test with consideration of effective degree of freedom (24). The DSL and DSE are derived from the P_M merged daily rainfall data and the unit is pentads per decade (pen/dec) and days per decade (d/dec).