TABLE 3.

Study cohort’s IBS characteristics (N=461).

Variable	n (%) or mean ± standard deviation
IBS subtype:
IBS-C	113 (24.5)
IBS-D	126 (27.3)
IBS-M	221 (47.9)
IBS-U	1 (0.2)
Most bothersome IBS symptom:
Abdominal pain	258 (56.0)
Constipation	100 (21.7)
Diarrhea	92 (20.0)
Not sure	11 (2.4)
Number of acute pain episodes in past month:
2 episodes	89 (19.3)
3 episodes	129 (28.0)
≥4 episodes	243 (52.7)
Average severity of acute pain episodes in past month (0-10 scale):
4	21 (4.6)
5	42 (9.1)
6	86 (18.7)
7	138 (29.9)
8	111 (24.1)
9	28 (6.1)
10	35 (7.6)
PROMIS abdominal pain score (percentile) †	78.5 ± 17.0
Currently taking IBS medicine	343 (74.4)
Currently taking other medicine for pain	433 (93.9)

IBS, irritable bowel syndrome; IBS-C, irritable bowel syndrome with constipation; IBS-D, irritable bowel syndrome with diarrhea; IBS-M, mixed irritable bowel syndrome; IBS-U, unsubtyped irritable bowel syndrome; PROMIS, Patient-Reported Outcomes Measurement Information System.

^†Assesses severity of respondents’ abdominal pain in the past week. Higher score corresponds to more severe symptoms.