Table 3 Standardized regression weights (SRW) and standard errors (SE) for SEM models of physical activity and physical function from 6 weeks to 24 months after lumbar spine surgery (N=248)

PA → PA

1.21(0.11)

1.06(0.09)

1.10(0.09)

1.07(0.09)

1.14(0.10)

1.12(0.93,1.31)

0.0001

PF → PA

n.s.

n.s.

n.s.

n.s.

n.s.

n.s.

n.s.

PF → PF

1.33(0.20)

1.14(0.17)

1.21(0.16)

1.08(0.16)

1.14(0.16)

1.18(0.85,1.52)

0.0001

PA → PF

0.20(0.05)

0.18(0.05)

0.16(0.05)

0.23(0.05)

0.20(0.05)

0.19(0.09,0.30)

0.0006

PA →PA

0.77(0.08)

0.70(0.08)

0.80(0.08)

0.75(0.09)

0.73(0.09)

0.75(0.59,0.91)

0.0001

PF → PA

0.13(0.04)

0.10(0.05)

0.14(0.04)

0.17(0.04)

0.15(0.05)

0.14(0.05,0.22)

0.0062

PF → PF

0.85(0.09)

0.93(0.09)

0.86(0.09)

0.94(0.11)

0.87(0.10)

0.89(0.70,1.07)

0.0001

PA → PF

0.08(0.06)

0.07(0.05)

0.09(0.06)

0.05(0.06)

0.10(0.06)

0.08(-0.03,0.19)

0.1728

PA → PA

0.99(0.06)

0.82(0.07)

0.98(0.06)

0.95(0.06)

0.77(0.07)

0.90(0.78,1.02)

0.0001

PF → PA

n.s.

n.s.

n.s.

n.s.

n.s.

n.s.

n.s.

PF → PF

0.77(0.07)

0.85(0.07)

0.68(0.08)

0.74(0.07)

0.74(0.07)

0.76(0.62,0.90)

0.0001

PA → PF

0.20(0.06)

0.12(0.06)

0.18(0.06)

0.20(0.06)

0.21(0.05)

0.18(0.07,0.30)

0.0102

Fit statistics

CFI

0.94

0.92

0.94

0.93

0.95

TLI

0.92

0.89

0.92

0.91

0.94

RMSEA

0.065

0.073

0.067

0.070

0.057

SRMR

0.06

0.06

0.05

0.05

0.05

Stability index

<0.001

<0.001

<0.001

<0.001

<0.001