Table 4b.

Six categories of similar patterns of approximated Episodes-of-Pain groups for “Users” of back pain services (N = 8,244)

		CCC “205”	ICD “846”,“847”	Both
A1) Single BP Period - Uncensored One “active” round preceded and followed by “inactive” rounds Round-by-Round Patterns: OOOXO, OOXOO, OXOOO	n = 2,179	77.8%	21.8%	.4%
A2) Single BP Period – Censored One “active” round bounded on one side by sample frame and bounded on other side by “inactive” rounds Round-by-Round Patterns: OOOOX, XOOOO	n = 1,187	82.5%	17.3%	.3%
B1) Two contiguous BP Periods - Uncensored Two “active” rounds preceded and followed by “inactive” round Round-by-Round Patterns: OXXOO, OOXXO	n = 510	83.7%	12.7%	3.5%
B2) Two contiguous BP Periods - Censored Two “active” rounds bounded on one side by sample frame and bounded on other side by “inactive” rounds Round-by-Round Patterns: XXOOO, OOOXX	n = 808	86.1%	10.9%	3.0%
C) Three or more contiguous BP Periods Round-by-Round Patterns: OOXXX, OXXXO, XXXOO, OXXXX, XXXXO, XXXXX	n = 2,198	93.2%	3.5%	3.3%
D) Multiple, recurrent BP Periods Two or more “active” rounds interspersed with “inactive” rounds Round Patterns: OOXOX, OXOOX, OXOXO, OXOXX, OXXOX, XOOOX, XOOXO, XOOXX, XOXOO, XOXOX, XOXXO, XOXXX, XXOOX, XXOXO, XXOXX, XXXOX.	n = 1,362	88.1%	7.6%	4.3%

Note: Reading Row one as example, of the 2,179 individuals in category (A1), 77.8% were identified with only the chronic back pain CCC code “205” in the MEPS Medical Conditions file, 21.8% were identified with only the acute back pain ICD “846” or “847” codes, and less than 1% were identified as having both types of medical conditions, conditions coded as CCC “205” and conditions coded as ICD “846”, “847”. This tables constructs 6 categories of similar patterns of approximated Episodes-of-Pain groups, for adult BackPain cases identified in MEPS Panels 5-through-10 Medical Conditions file, who also have ambulatory utilization events (N = 8,244).