Elsevier

The Lancet

Volume 371, Issue 9623, 3–9 May 2008, Pages 1519-1525
The Lancet

Articles
Assessment of pain: a community-based diary survey in the USA

https://doi.org/10.1016/S0140-6736(08)60656-XGet rights and content

Summary

Background

Pain is costly and a major reason for seeking medical care. Our aim was to assess the proportion of people experiencing pain, and the severity of pain, at randomly selected times in a representative sample of individuals in the USA.

Methods

A community-based telephone survey was designed that attempted to contact about 10 700 individuals by random-digit dialling. After collecting diary information for one 24-h period, ratings of pain on a 0–6 anchored scale for three randomly selected 15-min intervals of the day were obtained. Outcome measures were the proportion of intervals with non-zero pain, the proportion of intervals with pain above 3 (the scale midpoint), and the average pain rating. Activities of those individuals who reported substantial pain were also examined. To make the results representative of the US population, sample data were adjusted with sample weights developed by the Gallup Organisation.

Findings

3982 individuals were interviewed (response rate 37%). After adjustment for weighting, 28·8% of men and 26·6% of women reported feeling some pain at sampled times. Those with lower income or less education spent a higher proportion of time in pain and reported higher average pain than did those with higher income or more education. The average pain rating increased with age, although it reached a plateau between the ages of about 45 years and 75 years, with little difference between men and women. Satisfaction with life or health and the pain indicators tended to move in opposite directions.

Interpretation

The diary-survey methods described here could be used to study pain at the population level, and will enable the combination of pain assessments with information about activities of daily living.

Funding

US National Institute of Aging, Hewlett Foundation.

Introduction

Pain imposes considerable costs on the health-care system and economy. The occurrence of pain is a major reason that individuals seek medical attention and take medications. In the USA, over US$2·6 billion was spent on non-prescription analgesics in the 52 weeks ending March 25, 2007,1 and in 2004—the most recent year with data available—$13·8 billion was spent on outpatient prescription analgesics.2 Pain also decreases labour force participation and is estimated to cost over $60 billion a year in lost productivity.3, 4, 5

Our current understanding of people's experience of pain is limited to pain associated with certain conditions (eg, arthritis, back injury) and to those with chronic pain.6, 7, 8 Little is known about the prevalence or severity of daily pain from any origin. The US Centers for Disease Control and Prevention (CDC) recently did a survey of the number of days people recalled experiencing pain during the previous month,9 but this study's month-long recall period was likely to cause considerable distortion.10 Four studies from other countries provide estimates of the prevalence of any pain during a day or at the moment the survey was filled out. Gerdle and colleagues11 found that 49% of a Swedish sample of 7637 individuals reported current pain in a postal survey (“Do you have pain anywhere in the body today?”) and Turunen,12 who asked a sample of 4542 Finns in a postal survey about their point-in-time pain (“Do you feel any pain or ache right now, at this very moment?”), reported a rate of 37%. Buskila and colleagues13 reported that 44% of 2210 individuals in a southern Israel sample indicated pain on the day they were interviewed. Finally, a survey of 5000 Spaniards interviewed by telephone found that 30% of respondents had pain the previous day.14

A more complete understanding of the likelihood and manifestations of pain in the general population can give health-care providers and researchers a better sense of the circumstances that cause many individuals to seek medical treatment and of the background level of pain experienced by the general population. We developed a diary-based survey to estimate the occurrence and severity of pain in the general US population at representative moments (defined as 15-min intervals) of the day. We also obtained social and environmental descriptions of each episode to provide a more accurate and richer description of the pain experience than possible with previous studies.9, 15, 16, 17

Section snippets

Data collection

We designed the Princeton affect and time survey (PATS), which was based on the US Bureau of Labor Statistics' American time use survey (ATUS) and the day reconstruction method, a technique used to characterise experiences over the course of a day.18 The survey was administered by the Gallup Organisation (Omaha, NE, USA) in a telephone survey from May to August, 2006. An attempt was made to interview about 10 700 individuals aged 15 years or older using a random-digit dialling technique such

Results

3982 people completed the survey. The cooperation rate was 75% and the response rate was 37%. 2429 (61%) participants were women; 3504 (88%) were white; 677 (17%) had a disability; 3584 (90%) had a high school education or higher; and 1593 (40%) had a yearly household income of less than US$40 000. The average age of participants was 51·4 years (range 15–99). After weighting, the sample had fewer women (53%), higher income (36% below $40 000), fewer disabled (13%), and a lower average age (45·2

Discussion

Our findings show that by collecting time diary data with the procedures used in the ATUS, together with recalled emotional experiences, the PATS method could be used to describe a representative sample's experiences with pain. PATS provides a summary of how pain varies across respondents at randomly selected time intervals, which can be linked to the activities in which individuals engaged. Our use of one item to measure pain intensity at recalled episodes is consistent with recent consensus

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