Table 2.

Frailty model parameter estimates for the stratified data sets during 3- and 5-year observation periods

Data
Parameter estimates
Deviance (Dev) statistics
Study periods and groupsObs.α95% C.I.β per year95% C.I.δ95% C.I.ε per year95% C.I.DevDev,* mean (SD)P value
Men
    3-year
        18–29 y2705.72.0–6.00.830.75–1.700.520.35–0.610.950.64–1.02129.9120.7 (12.1)0.2246
        30–39 y3281.51.1–3.00.260.19–0.330.660.50–0.850.630.48–0.81127.4123.7 (13.5)0.3906
        40–49 y3294.52.0–16.10.130.09–1.170.800.56–0.950.600.46–0.7878.873.9 (9.8)0.3071
        Single30111.57.0–27.01.261.00–1.580.500.40–0.591.241.08–1.43172.3141.8 (13.1)0.0101
        Cohab6251.20.8–2.60.140.11–0.170.670.42–0.870.350.27–0.4598.592.3 (12.1)0.3054
    5-year
        18–29 y2603.42.0–5.51.130.74–1.720.480.35–0.600.770.64–0.94181.4165.0 (13.8)0.1189
        30–39 y3281.30.9–2.10.130.08–0.200.630.48–0.770.490.37–0.63192.5179.2 (15.5)0.1965
        40–49 y3281.81.1–3.10.080.05–0.120.650.44–0.830.470.34–0.63111.6103.1 (11.7)0.2335
        Single2927.65.0–13.01.260.90–1.770.460.37–0.551.100.93–1.28224.9207.4 (14.9)0.1191
        Cohab6230.90.7–1.60.100.07–0.130.630.43–0.780.260.20–0.34145.3137.5 (14.9)0.2993
Women
    3-year
        18–29 y4344.52.5–16.20.460.37–0.570.640.51–0.790.620.52–0.7276.587.1 (11.2)0.8270
        30–39 y4261.61.6–3.50.120.09–0.160.360.13–0.620.710.55–0.8959.860.8 (10.1)0.5401
        40–49 y3573.31.6–17.00.120.08–0.160.500.20–0.770.620.47–0.8232.339.5 (8.1)0.8105
        Single3615.53.1–13.21.331.05–1.740.320.19–0.461.140.98–1.3286.884.6 (11.2)0.4215
        Cohab8505.52.0–15.50.090.07–0.110.560.34–0.840.300.24–0.3551.939.4 (8.0)0.0574
    5-year
        18–29 y4221.81.3–3.00.640.45–0.860.600.49–0.730.450.35–0.55112.6131.8 (13.9)0.9164
        30–39 y4161.50.9–2.80.070.04–0.110.570.31–0.800.420.30–0.5967.279.4 (11.3)0.8601
        40–49 y3491.20.7–3.60.080.05–0.110.360.09–0.690.500.35–0.7156.752.4 (9.5)0.3232
        Single3464.52.6–8.91.961.32–3.020.380.25–0.500.920.77–1.10125.1126.2 (13.4)0.0082
        Cohab8352.11.2–15.50.060.04–0.080.600.40–0.800.190.14–0.2475.863.7 (10.2)0.1175
  • Analysis of data sets stratified by civil status and age. The data are separated into classes of single individuals living alone and those cohabitating (cohab) during the previous 1-year time period before the study ended. The age-stratified data sets were constructed by grouping the sample population into three 10-year age cohorts based on age by the end of the survey. The δ exponents are found to be distinctly sublinear. The parameter estimates β and ε are significantly increased for persons living singly and among young men between the ages of 18 and 29, whereas these baseline parameters are reduced for people in a live-in relationship. Lt, lifetime; Obs., observations.

  • *Sample of deviance generated from bootstrapping the data.