Table 4.

Data for Chi-square test of Independence

	Prior treatment attempted
	No	Yes	Total
Psychological disorder diagnoses
None
Count	15	23	38
Expected Count	10.1	27.9	38
% within number of psychological diagnoses	39.5	60.5	100
% within prior treatment attempted	71.4	39.7	48.1
% total	19	29.1	48.1
Adjusted residual	2.5	−2.5
1
Count	4	16	20
Expected count	5.3	14.7	20
% within number of psychological diagnoses	20	80	100
% within prior treatment attempted	19	27.6	25.3
% total	5.1	20.3	25.3
Adjusted residual	−0.8	0.8
Both
Count	2	19	21
Expected count	5.6	15.4	21
% within number of psychological diagnoses	9.5	90.5	100
% within prior treatment attempted	9.5	32.8	26.6
% total	2.5	24.1	26.6
Adjusted residual	−2.1	2.1
Total
Count	21	58	79
Expected count	21	58	79
% within number of psychological diagnoses	26.6	73.4	100
% within prior treatment attempted	100	100	100
% total	26.6	73.4	100

Chi-square tests	Value	Df	Asymptotic significance (2-sided)
Pearson Chi-square	6.811∗	2	0.033
Likelihood Ratio	7.284	2	0.026
Linear-by-linear Association	6.575	1	0.01

Symmetric measures		Value	Approximate significance
Nominal by nominal	Phi	0.294	0.033
	Cramer's V	0.294	0.033

A chi square test of independence was conducted between number of psychological diagnoses and whether prior treatment was attempted by the patient. All expected cell frequencies were greater than 5. There was a statistically significant association between number of psychological diagnoses and whether prior treatment was attempted by the patient, χ² (2) = 6.811, P = .033. There was a very strong association between number of psychological diagnoses and whether prior treatment was attempted, phi = 0.294, P = .033

^∗0 cells (0.0%) have expected count less than 5. The minimum expected count is 5.32.