. 2013 Jul 23;8(7):e69015. doi: 10.1371/journal.pone.0069015

Table 3. Multiple regression model summaries and regression coefficients of the significant climate variables and when year added (if significant improvement to model).

					DWD German mean temperature (°C)
	Period	R²	Year	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct
Yield (hl/ha)	1 (1805–1914)	33% ^***				1.08^**	2.31^***	1.29^**
	2 (1915–1952)	36% ^**					5.14^**		4.82^*
	3 (1962–2010)	28% ^**							4.48^**	3.36^*
	3 (1962–2010)	34%^***	0.29 (p = 0.051)						2.95 n.s.	3.17^*
	1–3 (1805–2010)	31% ^***		1.14^*		1.93^*	2.85^**	2.63^**	3.75^***
	1–3 (1805–2010)	68% ^***	0.22^***	-0.15 n.s.		0.89 n.s.	2.53^***	1.12 n.s.	1.90^**
Mean must sugar content (°Oe)	1S (1864–1905)	28% ^**						2.39^**			1.93^*
	3S (1962–2010)	43% ^***			5.33^**			4.54^**	4.04^*
	3S (1962–2010)	48%^***	0.40 (p = 0.061)		3.62 n.s.			3.83^*	2.43 n.s.
	1S&3S (1864–2010)	35% ^***			3.07^**			3.65^***	3.39^***

Data are presented separately for all periods and overall. Key to significance of coefficients:

p<0.05,

^**

p<0.01,

^***

p<0.001 and n.s. not significant.