Table 3. Shape of the M–P relationship...

Table 3.

Shape of the M–P relationship by year of published articles

		POS LIN N = 38	NEG LIN N = 12	U N = 15	INV U N = 29	S N = 19	M N = 3	NONE N = 10	No. of published articles N = 115
1977–1987		1	1						3
	1983								1
	1986		1						1
	1987	1							1
1988–1998		2			3	1		4	10
	1989	1			1			1	3
	1995							1	1
	1996	1			1			1	3
	1997				1				1
	1998					1		1	2
1999–2009		13	3	8	9	7		1	36
	1999				1				1
	2000	1	1						2
	2001	1		1					2
	2002	1							1
	2003			3	1	1			4
	2004		1			2			3
	2005	2							2
	2006	2		1	2				4
	2007	2		2	2	2			5
	2008	3			1	2		1	7
	2009	1	1	1	2				5
2010–2021		22	8	7	17	11	3	5	66
	2010				3	2			5
	2011	2	1		1				4
	2012	3	1		2	3	1	1	11
	2013	3	1			1	1		6
	2014	1	1		3		1		5
	2015	1	1		1	1			3
	2016	1	1	3	2	2		1	7
	2017	5		1	1	1		2	8
	2018	3	1		1	1			6
	2019	2		2	1				4
	2020		1					1	2
	2021	1		1	2				5

		POS LINN = 38	NEG LINN = 12	UN = 15	INVUN = 29	SN = 19	MN = 3	NONEN = 10	No. of published articlesN = 115
1977–1987		1	1						3
	1983								1
	1986		1						1
	1987	1							1
1988–1998		2			3	1		4	10
	1989	1			1			1	3
	1995							1	1
	1996	1			1			1	3
	1997				1				1
	1998					1		1	2
1999–2009		13	3	8	9	7		1	36
	1999				1				1
	2000	1	1						2
	2001	1		1					2
	2002	1							1
	2003			3	1	1			4
	2004		1			2			3
	2005	2							2
	2006	2		1	2				4
	2007	2		2	2	2			5
	2008	3			1	2		1	7
	2009	1	1	1	2				5
2010–2021		22	8	7	17	11	3	5	66
	2010				3	2			5
	2011	2	1		1				4
	2012	3	1		2	3	1	1	11
	2013	3	1			1	1		6
	2014	1	1		3		1		5
	2015	1	1		1	1			3
	2016	1	1	3	2	2		1	7
	2017	5		1	1	1		2	8
	2018	3	1		1	1			6
	2019	2		2	1				4
	2020		1					1	2
	2021	1		1	2				5

Notes:

Some papers have either found multiple different shapes or have not made a clear statement about the identified shape of the relationship. Therefore, the amount of papers published per period does not match the total amount of identified shapes per period. POS LIN = The paper has found a positive linear relationship between M and P; NEG LIN = The paper has found a negative linear relationship between M and P; U = The paper has found a U-shaped relationship between M and P; INV U = The paper has found an inverted U-shaped relationship between M and P; S = The paper has found a S-shaped relationship between M and P; M = The paper has found a M-shaped relationship between M and P; NONE = The paper has found no relationship between M and P

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