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Table 5 Age categories-stratified analysis of mediation effect of health literacy

From: The impact of social capital on physical activity and nutrition in China: the mediating effect of health literacy

ModelPath< 45 years old45–59 years old60–69 years old
β95% CIp-valueProportion mediatedβ95% CIp-valueProportion mediatedβ95% CIp-valueProportion mediated
social participation to physical activityTotal effect (c)0.803(0.624, 0.982)< 0.001 0.636(0.455, 0.816)< 0.001 0.819(0.682, 0.955)< 0.001 
Direct effect (c’)0.708(0.526, 0.891)< 0.001 0.537(0.353, 0.720)< 0.001 0.767(0.633, 0.902)< 0.001 
Indirect effect (a x b)0.095(0.037, 0.169) 11.83%0.099(0.038, 0.176) 15.57%0.051(0.012, 0.105) 6.23%
social networks to physical activityTotal effect (c)1.551(1.004, 2.097)< 0.001 1.303(0.769, 1.837)< 0.001 1.691(1.332, 2.051)< 0.001 
Direct effect (c’)1.259(0.716, 1.801)< 0.001 1.131(0.622, 1.640)< 0.001 1.61(1.266, 1.955)< 0.001 
Indirect effect (a x b)0.292(0.114, 0.511) 18.83%0.172(−0.076, 0.422) 0.081(−0.027, 0.212) 
social support to physical activityTotal effect (c)0.670(0.509, 0.831)< 0.001 0.809(0.643, 0.976)< 0.001 0.793(0.671, 0.915)< 0.001 
Direct effect (c’)0.578(0.410, 0.747)< 0.001 0.728(0.549, 0.908)< 0.001 0.744(0.622, 0.866)< 0.001 
Indirect effect (a x b)0.091(0.036, 0.158) 13.58%0.081(0.006, 0.161) 10.01%0.049(0.013, 0.102) 6.18%
Control over life to physical activityTotal effect (c)0.780(0.412, 1.149)< 0.001 1.069(0.673, 1.464)< 0.001 0.935(0.637, 1.232)< 0.001 
Direct effect (c’)0.598(0.238, 0.957)0.001 0.87(0.479, 1.260)< 0.001 0.875(0.590, 1.161)< 0.001 
Indirect effect (a x b)0.183(0.062, 0.343) 23.46%0.199(0.071, 0.372) 18.62%0.059(−0.033, 0.160) 
feelings about the community to physical activityTotal effect (c)0.695(0.373, 1.018)< 0.001 0.917(0.594, 1.240)< 0.001 0.914(0.650, 1.179)< 0.001 
Direct effect (c’)0.570(0.260, 0.880)< 0.001 0.737(0.413, 1.062)< 0.001 0.846(0.591, 1.102)< 0.001 
Indirect effect (a x b)0.125(0.014, 0.258) 17.99%0.18(0.062, 0.357) 19.63%0.068(−0.008, 0.160) 
social participation to nutritionTotal effect (c)0.341(0.156, 0.526)< 0.001 0.272(0.102, 0.443)0.002 0.405(0.272, 0.538)< 0.001 
Direct effect (c’)0.240(0.051, 0.429)0.013 0.2(0.024, 0.375)0.026 0.379(0.244, 0.514)< 0.001 
Indirect effect (a x b)0.102(0.041, 0.180) 29.91%0.072(0.020, 0.142) 26.47%0.026(0.001, 0.063) 6.42%
social networks to nutritionTotal effect (c)1.000(0.490, 1.509)< 0.001 0.675(0.199, 1.150)0.006 1.1(0.779, 1.421)< 0.001 
Direct effect (c’)0.760(0.249, 1.271)0.004 0.567(0.098, 1.035)0.018 1.061(0.743, 1.380)< 0.001 
Indirect effect (a x b)0.239(0.088, 0.428) 23.90%0.108(−0.048, 0.278) 0.039(−0.013, 0.113) 
social support to nutritionTotal effect (c)0.394(0.235, 0.552)< 0.001 0.504(0.344, 0.663)< 0.001 0.576(0.466, 0.687)< 0.001 
Direct effect (c’)0.306(0.139, 0.472)< 0.001 0.456(0.282, 0.630)< 0.001 0.56(0.448, 0.673)< 0.001 
Indirect effect (a x b)0.088(0.033, 0.152) 22.34%0.048(−0.029, 0.114) 0.016(−0.011, 0.047) 
Control over life to nutritionTotal effect (c)0.833(0.509, 1.156)< 0.001 0.609(0.256, 0.963)0.001 0.843(0.597, 1.089)< 0.001 
Direct effect (c’)0.704(0.382, 1.026)< 0.001 0.485(0.127, 0.842)0.008 0.815(0.572, 1.059)< 0.001 
Indirect effect (a x b)0.129(0.039, 0.257) 15.49%0.125(0.030,, 0.258) 20.53%0.027(−0.013, 0.088) 
feelings about the community to nutritionTotal effect (c)0.954(0.686, 1.223)< 0.001 0.956(0.693, 1.219)< 0.001 1.031(0.827, 1.235)< 0.001 
Direct effect (c’)0.870(0.607, 1.134)< 0.001 0.882(0.610, 1.154)< 0.001 1.003(0.800, 1.207)< 0.001 
Indirect effect (a x b)0.084(0.009, 0.170) 8.81%0.074(0.001, 0.181) 7.74%0.027(−0.004, 0.075)