Quartiles of UA age GGT ALB GLO BUN CREA CHOL Hb HCT MCV MCH RDW WBC PDW MPV PCT diet drinking smoking quality of sleep exercise Intercept Q4 Q3 Q2 Q1 time baseage GGT ALB GLO CHOL Hb MCV MCH WBC 0.2587 0.0243 0.0095 0.037 −0.0574 −0.0083 −0.0004 0.3292 0.0242 0.0119 −0.0296 0.0905 −0.0613 0.1391 0.0045 −0.0034 −1.4813 −0.0248 0.0172 0.0044 −0.0242 0.015 −5.3378 0.5259 0.1856 0.0709 0 0.3072 0.0308 0.0091 −0.018 0.0228 0.1285 0.012 −0.1321 0.2862 0.1531 1.4182 0.1194 0.1244 0.1274 0 0.026 0.0034 0.0011 0.018 0.0103 0.0468 0.0046 0.019 0.0462 0.0242 Zhang et al. BMC Public Health 2012, 12:419 http://www.biomedcentral.com/1471-2458/12/419 Table 2 Single-predictor GEE Models Estimate Table 3 The results of multiple GEE analysis for UA levels and MetS after adjusting other potential confounding factors Estimate Error Z Pr > |Z| RR lower 95 % upper 95 % Confidence Limits Confidence Limits Standard Error 0.0448 0.0031 0.0012 0.0097 0.0172 0.0431 0.0053 0.0491 0.0052 0.0173 0.0112 0.0286 0.0674 0.0276 0.0299 0.0623 1.0857 0.0535 0.029 0.0241 0.062 0.103 −3.76 4.41 1.49 0.56 ref 11.84 9.16 7.96 −1 2.21 2.74 2.63 −6.96 6.19 6.33 Z 5.78 7.94 8.15 3.8 −3.33 −0.19 −0.08 6.7 4.67 0.69 −2.64 3.17 −0.91 5.05 0.15 −0.05 −1.36 −0.46 0.59 0.18 −0.39 0.15 0.0002 <.0001 0.1357 0.5778 ref <.0001 <.0001 <.0001 0.3197 0.0268 0.0061 0.0086 <.0001 <.0001 <.0001 Pr > |Z| <.0001 <.0001 <.0001 0.0001 0.0009 0.8474 0.933 <.0001 <.0001 0.4913 0.0083 0.0015 0.3632 <.0001 0.8795 0.9563 0.1725 0.6433 0.5539 0.8536 0.696 0.8841 RR 1.2952 1.0246 1.0095 1.0377 0.9442 0.9917 0.9996 1.3899 1.0245 1.0120 0.9708 1.0947 0.9405 1.1492 1.0045 0.9966 0.2273 0.9755 1.0173 1.0044 0.9761 1.0151 lower 95% Confidence Limits 1.1864 1.0185 1.0072 1.0181 0.9128 0.9114 0.9894 1.2623 1.0142 0.9782 0.9496 1.0351 0.8242 1.0888 0.9474 0.8821 0.0271 0.8784 0.9611 0.9582 0.8644 0.8295 1.6920 1.2039 1.0735 ref 1.3596 1.0313 1.0091 0.9822 1.0231 1.1371 1.0121 0.8763 1.3314 1.1654 1.3390 0.9435 0.8363 ref 1.2923 1.0245 1.0069 0.9481 1.0026 1.0374 1.0031 0.8443 1.2160 1.1115 Page 4 of 8 upper 95% Confidence Limits 1.4141 1.0308 1.0118 1.0576 0.9766 1.0792 1.0099 1.5304 1.0350 1.0470 0.9924 1.1579 1.0734 1.2130 1.0651 1.1259 1.9092 1.0834 1.0768 1.0530 1.1021 1.2423 2.1381 1.5363 1.3780 ref 1.4306 1.0381 1.0115 1.0176 1.0439 1.2463 1.0212 0.9095 1.4575 1.2220