Table 2.
Parameter estimates (and 95 % confidence intervals) from fitting the univariate biometric dual change score model
| Parameters | Spatial factor | Speed factor | FEV1 |
|---|---|---|---|
| Fixed effects | |||
| Mean intercept, μ0 | 54.98 (53.94, 56.04) | 56.95 (55.94, 57.96) | 55.24 (54.02, 56.47) |
| Mean slope, μs | −9.67 (−12.17, −7.34) | −8.06 (−9.74, −6.43) | −0.17 (−2.63, 2.17) |
| Constant change, α | =1 | = 1 | = 1 |
| Proportional change, β | 0.17 (0.12, 0.22) | 0.13 (0.09, 0.16) | −0.02 (−0.06, 0.03) |
| Random effects | |||
| Intercept deviation, σ0 | |||
| Additive genetic | 8.29 (6.63, 9.47) | 7.66 (6.00, 8.44) | 5.33 (2.13, 7.52) |
| Shared environment | 2.64 (−5.56, 5.56) | 0.00 (−4.55, 4.55) | 3.41 (−6.07, 6.07) |
| Nonshared environment | 3.26 (2.15, 4.30) | 2.93 (1.83, 3.98) | 5.93 (4.75, 7.16) |
| Slope deviation, σs | |||
| Additive genetic | 0.07 (−0.26, 0.26) | −0.26 (−0.39, 0.39) | 0.00 (−0.71, 0.71) |
| Shared environment | 0.00 (−0.21, 0.21) | 0.00 (−0.22, 0.22) | −0.16 (−0.59, 0.59) |
| Nonshared environment | −0.17 (−0.27, 0.27) | 0.23 (−0.32, 0.32) | −0.41 (−0.65, 0.65) |
| Slope on level | |||
| Additive genetic | −1.42 (−1.98, −0.91) | −1.00 (−1.31, −0.54) | 0.28 (−0.34, 0.69) |
| Shared environment | −0.56 (−1.16, 1.16) | 0.00 (−0.79, 0.79) | −0.34 (−0.63, 0.63) |
| Nonshared environment | −0.58 (−0.88, −0.22) | −0.46 (−0.73, −0.10) | −0.27 (−0.54, 0.03) |
| Error deviation, σu | 17.45 (16.20, 18.83) | 17.67 (16.45, 19.01) | 23.55 (21.96, 25.29) |