Prevalence and Characterization of Breakthrough Pain Associated with Chronic Low Back Pain in the South of Spain: A Cross-Sectional, Multicenter, Observational Study

Table 2

Characteristics of BTP episodes.

		%
Number of BTP episodes last month^1
1–5	46	15.7
5–10	74	25.3
10–15	65	22.2
>15	108	36.9
Duration of BTP episodes (minutes)^1
1–14	56	19.1
15–29	80	27.3
30–45	95	32.4
>45	62	21.2
Time until pain relief (minutes)^2
1–5	30	10.3
6–10	99	33.9
11–15	65	22.3
16–30	49	16.8
>30	49	16.8
Number of episodes per day^1
0	23	7.8
1–5	206	70.3
≥5	64	21.8

Percentage calculated over the number of patients with information available ; percentage calculated over the number of patients with information available .