Zhang et al. BMC Public Health 2012, 12:419 http://www.biomedcentral.com/1471-2458/12/419 Page 5 of 8 Table 4 The results of multiple GEE analysis for UA levels and Obesity after adjusting other potential confounding factors Quartiles Estimate Error Z Pr > |Z| RR lower 95 % upper 95 % Confidence Limits Confidence Limits Table 5 The results of multiple GEE analysis for UA levels and hypertension after adjusting other potential confounding factors lower 95 % Confidence Limits upper 95 % Confidence Limits 1.2639 1.0178 0.8375 ref 1.1969 0.5969 1.0766 1.0600 1.0655 1.0057 0.9797 1.0016 0.9608 1.0074 0.9481 0.9500 1.0175 −0.3359 0.9224 0.7133 0.4271 0 0.1446 0.2913 −0.0503 −0.0117 0.0055 0.0061 −0.044 −0.0075 0.0115 0.0188 −0.0147 −0.0155 0.0597 Estimate −5.9514 0.3953 0.1751 −0.0189 0 0.345 −0.3991 0.1882 0.101 0.0686 0.0077 0.0028 0.0155 0.0216 0.0135 −0.0276 0.0114 0.0538 0.8418 0.0695 0.0653 0.0634 0 0.0581 0.0484 0.0778 0.0191 0.0023 0.0013 0.0096 0.0063 0.0269 0.0028 0.0109 0.0264 0.0162 Error 1.0022 0.0822 0.0804 0.0808 0 0.0843 0.0596 0.0584 0.0218 0.0027 0.001 0.0119 0.0071 0.0314 0.0031 0.0131 0.032 0.0186 Intercept Q4 Q3 Q2 Q1 hypertension dyslipidemia hyperglycemia time baseage GGT ALB GLO CHOL Hb MCV MCH WBC Intercept Q4 Q3 Q2 Q1 hyperglycemia dyslipidemia obesity time baseage GGT ALB GLO CHOL Hb MCV MCH WBC 2.8823 2.3194 1.7357 ref 1.2950 1.4712 1.1075 1.0261 1.0101 1.0085 0.9752 1.0048 1.0663 1.0245 1.0067 1.0370 1.0959 1.7444 1.3947 1.1496 ref 1.6658 0.7541 1.3534 1.1544 1.0767 1.0097 1.0263 1.0298 1.0867 1.0198 0.9982 1.0768 1.0945 −0.4 13.28 10.92 6.73 ref 2.49 6.02 −0.65 −0.61 2.42 4.86 −4.56 −1.2 0.43 6.81 −1.34 −0.59 3.68 Z −5.94 4.81 2.18 −0.23 ref 4.09 −6.69 3.22 4.64 25.55 7.62 0.23 2.19 0.69 4.31 −2.1 0.36 2.8900 0.6899 <.0001 <.0001 <.0001 ref 0.0128 <.0001 0.5176 0.5417 0.0155 <.0001 <.0001 0.2319 0.6702 <.0001 0.179 0.5574 0.0002 2.5153 2.0407 1.5328 ref 1.1556 1.3382 0.9509 0.9884 1.0055 1.0061 0.9570 0.9925 1.0116 1.0190 0.9854 0.9846 1.0615 Pr > |Z| <.0001 <.0001 0.0294 0.8146 ref <.0001 <.0001 0.0013 <.0001 <.0001 <.0001 0.8149 0.0285 0.4923 <.0001 0.0357 0.722 0.0039 2.1953 1.7955 1.3536 ref 1.0312 1.2170 0.8164 0.9520 1.0010 1.0036 0.9390 0.9805 0.9595 1.0135 0.9646 0.9349 1.0283 RR 1.4848 1.1914 0.9813 ref 1.4120 0.6709 1.2071 1.1063 1.0710 1.0077 1.0028 1.0156 1.0218 1.0136 0.9728 1.0115 1.0553