Table 3.

Frequency of pain assessment as reported by centers of different World Bank income levels.

Frequency of pain assessment*	Low and lower middle income		Upper middle income		High income		All centers
	n	%	n	%	n	%	n	%
Every 1–3 h	21	21.0	17	7.5	50	29.2	88	17.7
Every 4–8 h	10	10.0	45	19.8	48	28.1	103	20.7
Once/twice per day	25	25.0	48	21.1	15	8.8	88	17.7
Continuously/regularly	18	18.0	85	37.4	16	9.4	119	23.9
At each clinical evaluation	0	0.0	8	3.5	21	12.3	29	5.8
As needed	4	4.0	7	3.1	6	3.5	17	3.4
Missing	22	22.0	17	7.5	15	8.8	54	10.8
Total	100	100	227	100	171	100	498	100

^*p-value < 0.001 using a Chi-square test.