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TABLE 1—

Frequency Distributions of Selected Sociodemographic Characteristics: UCLA Low Back Pain Study, 1995–2000

VariableSample (n = 681), %
Age, y
    < 309.4
    30–4940.2
    50–6932.2
    ≥ 7018.2
Gender
    Male48.0
    Female52.0
Race/ethnicity
    White/non-Hispanic60.4
    Latino/Hispanic29.8
    Asian/Pacific Islander4.5
    African American/Black2.8
    Other2.5
Education level
    High school or less29.6
    Some college39.5
    College30.8
Marital status
    Married/involved in relationship71.6
    Widowed/divorced/separated18.3
    Never married10.1
Employment status
    Employed full time58.7
    Employed part time8.1
    On leave/unemployed7.5
    Retired25.7
General health status
    Excellent8.1
    Very good37.0
    Good42.0
    Fair/poor12.9
Weekly metabolic equivalent task score,b%
    027.6
    0.1–10.4921.9
    10.5–25.925.5
    ≥ 2625.0
aThe mean age was 51.0 years (SD = 16.7); the median was 50 years.

bThe metabolic equivalent task score measures metabolic energy cost expressed as a multiple of the resting metabolic rate (the higher the score, the greater the energy expenditure from physical activity).