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Table 3 Meta-regression analysis coefficients of risk ratio and prevalence of COPD

From: Chronic obstructive pulmonary disease in rheumatoid arthritis: a systematic review and meta-analysis

Variables Coefficient (SE) 95% CI t P
Risk ratio
 Publication year −0.0772 (0.0179) [− 0.1270,-0.0275] −4.31 0.013
 Age of cases −0.0387(0.0185) [− 0.0975, 0.0201] −2.10 0.127
 N of cases <  0.0001(<  0.0001) [< −0.0001, 0.0002] 0.87 0.450
 N of controls <  0.0001(<  0.0001) [< −0.0001, <  0.0001] 1.83 0.164
 N of participants <  0.0001(<  0.0001) [< −0.0001, <  0.0001] 1.78 0.174
 Female proportion 0.0025(0.0019) [−0.0037, 0.0086] 1.28 0.290
 Follow up duration −0.0112 (0.0066) [−0.0320, 0.0097] −1.70 0.187
 Quality −0.2916 (0.1396) [−0.6793, 0.0962] −2.09 0.105
 Beginning of cohort −0.0085 (0.0053) [−0.0232, 0.0062] −1.61 0.182
 Duration of cohort 0.0073 (0.058) [−.0088, 0.0233] 1.25 0.278
Prevalence
 Publication year 0.0045 (0.0040) [−0.0052, 0.0143] 1.14 0.296
 Number of cases <  0.0001(<  0.0001) [< −0.0001, <  0.0001] 1.42 0.206
 Age of cases −0.0011 (0.0036) [−0.0099, 0.0078] − 0.30 0.777
 Female proportion −0.0015 (0.0011) [−0.0042, 0.0012] −1.36 0.221
 Smoker proportion 0.0031 (0.0006) [0.0012, 0.0049] 5.33 0.013
 Disease duration 0.0005 (0.0004) [−0.0008, 0.0019] 1.32 0.239
 Quality −0.0015 (0.0071) [−0.0188, 0.0159] − 0.21 0.844
  1. CI: confidence interval; N: number; SE: standard error