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. 2012 Nov 16;68(7):861–868. doi: 10.1093/gerona/gls228

Table 2.

Lower Extremity Function (mSPPB) Trajectory Estimates for the Full Sample†

Unadjusted‡ Survival adjusted‡ Health Adjusted‡ MRFs Adjusted‡ Fully Adjusted Except Survival Fully Adjusted‡
(M0) (M1) (M2.1) (M2.2) (M3.1) (M3.2)
Fixed effects
  Intercept§
    Intercept|| 5.27* 4.86* 4.75* 4.33* 5.20* 4.75*
    Women −0.73** −1.08* −0.76* −0.40 −0.18 −0.41
    Survival — 0.73* 0.44* 0.53* — 0.39*
  Linear slope
    Intercept −0.67* −0.92* −0.74* −0.82* −0.51* −0.66*
    Women 0.21* 0.18* 0.17* 0.16** 0.16** 0.15**
    Survival — 0.13* 0.07* 0.10* — 0.06*
  Quadratic slope
    Intercept −0.01** −0.04*** −0.02 −0.04*** −0.03*** −0.02
    Women 0.01 0.01 0.01 0.01 0.01 0.01
    Survival — 0.00 −0.01 0.00 — −0.01
  Cubic slope
    Intercept 0.01* 0.00* 0.01* 0.01** 0.01** 0.01**
    Women −0.00 −0.00 −0.00 −0.00 −0.00 −0.00
    Survival — −0.00 −0.00*** −0.00 — −0.00***
  Random effects (variance)
  Intercept 8.67* 5.93* 4.36* 4.05* 4.24* 3.76*
  Linear slope 0.11* 0.09* 0.07* 0.08* 0.07* 0.06*
  Quadratic slope 0.00* 0.00* 0.00* 0.00* 0.00* 0.00*
  Cubic slope 0.00*** 0.00*** 0.00*** 0.00 0.00*** 0.00***
  Level-1, E 1.94 1.91 1.83 1.88 1.83 1.81
  Deviance 17354.4 17104.1 16937.1 17001.1 16991.6 16938.4
  Estimated parameters (nr.) 11 11 11 11 11 11

Notes: mSPPB = modified Short Physical Performance Battery score.

† N = 690 participants/4111 observations.

‡Unadjusted M0 is the time-only model; M1,adjusted for length-of-survival; M2.1, adjusted for length-of-survival and health status; M2.2, adjusted for length-of-survival and modifiable risk factors, but not for health status; M3.1, adjusted for health status and MRFs, but not for length-of-survival; M3.2, fully adjusted for length-of-survival, health status and MRFs. M1, M2.1, M2.2, M3.1, and M3.2 tested with and without adjustment for age-at-baseline, education, race, and living arrangement; results from adjusted models are presented in the table.

§Time(t) centered at its grand mean in all models; consequently, mSPPB intercept should be interpreted as mSPPB score at mean follow-up time (6 years).

||Intercept for each fixed effect represents the estimate when all other variables are held constant as appropriate at 0 (binary variables) or at sample mean (continuous variables).

Level 1, E represents the residual intra-individual (ie, wave-to-wave) variation in mSPPB.

*p value < .001, **p value < .01, ***p value < .05.