Table 4.

Illustration of item response patterns for three items.

	United States		Netherlands
	Proportion	n	Proportion	n
ITEM 5: I AM MORE IRRITABLE, i HAVE SUDDEN MOOD SWINGS AND ANGRY OUTBURSTS
Always	0.054	14	0.087	9
Often	0.173	45	0.233	24
Sometimes	0.327	85	0.369	38
Rarely	0.373	97	0.243	25
Never	0.073	19	0.068	7
ITEM 10: MY ILLNESS AFFECTS MY EVERYDAY ACTIVITIES SUCH AS WORKING OR STUDYING
Very Much	0.233	58	0.282	29
Quite a Bit	0.177	46	0.291	30
Somewhat	0.227	59	0.243	25
Very Little	0.208	54	0.117	12
Not at All	0.165	43	0.068	7
ITEM 12: I AM WORRIED ABOUT MY HEALTH IN THE FUTURE
Very Much	0.369	96	0.117	12
Quite a Bit	0.242	63	0.311	32
Somewhat	0.308	80	0.359	37
Very Little	0.065	17	0.175	18
Not at All	0.015	4	0.039	4

Bolded values reflect for which group a higher proportion of participants endorsed the answer category.