International Journal of Bipolar Disorders

Table 5 Descriptive statistics of 103 Cases and 412 Controls

From: Lifetime risk of severe kidney disease in lithium-treated patients: a retrospective study

		Cases (N = 103)		Controls (N = 412)		p
Continuous variables		Mean	Std. Deviation	Mean	Std. Deviation	p
Start age (years)		55.51	13.74	57.84	12.81	0.105^a
S-Li (mmol/l)		0.61	0.09	0.59	0.10	0.138^a
Categorical variables	Category	Frequency	Percent	Frequency	Percent	p
Start creatinine						< 0.001^b
	0 (lower third)	31^d	30,1	213^c	51,7
	1 (middle third)	43^c	41,7	158^c	38,3
	2 (upper third)	29^d	28,2	41^c	10,0
CKD4 + by Matched age group
	0 (40–59 years)	9	8.7
	1 (60–69 years)	29	28.2
	2 (70–79 years)	40	38.8
	3 (≥ 80 years)	25	24.3

^aNormally distributed variables, independent samples t-test was used for comparison of means
^bCategorical variable, Pearsson’s chi-squared test was used for comparison of proportions
^c,dEach letter denotes a subset of categories of which column proportions do not differ significantly from each other at the 0.05 level

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