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Table 2 AZM Zones with the highest low birthweight rates and standardized incidence ratios, Michigan 2004-2006.

From: Geographic analysis of low birthweight and infant mortality in Michigan using automated zoning methodology

Zone LBW Cases Births Ratea 95% CI SIRb 95% CI RSE
298 160 972 16.4 15.4, 17.5 2.5 2.1, 2.9 7.9
295 105 722 14.5 13.4, 15.6 2.2 1.8, 2.7 9.7
318 44 303 14.5 10.5, 19.4 2.2 1.5, 2.9 15.0
288 265 1839 14.4 13.7, 15.0 2.2 1.9, 2.5 6.1
96 185 1297 14.2 13.4, 15.0 2.2 1.9, 2.5 7.3
282 256 1825 14.0 13.3, 14.6 2.1 1.9, 2.4 6.2
359 225 1605 14.0 13.3, 14.7 2.1 1.9, 2.4 6.6
283 224 1625 13.7 13.1, 14.4 2.1 1.8, 2.4 6.6
284 291 2214 13.1 12.5, 13.6 2.0 1.8, 2.2 5.8
111 73 561 13.0 10.1, 16.3 2.0 1.5, 2.4 11.7
95 286 2236 12.7 12.2, 13.3 1.9 1.7, 2.2 5.9
290 223 1764 12.6 12.0, 13.2 1.9 1.7, 2.2 6.6
281 365 2902 12.5 12.1, 13.0 1.9 1.7, 2.1 5.2
297 149 1216 12.2 11.5, 12.9 1.9 1.6, 2.2 8.1
360 220 1796 12.2 11.6, 12.8 1.9 1.6, 2.1 6.7
91 255 2083 12.2 11.7, 12.7 1.9 1.6, 2.1 6.2
300 194 1588 12.2 11.6, 12.8 1.9 1.6, 2.1 7.1
304 75 615 12.1 9.5, 15.2 1.9 1.4, 2.3 11.5
302 92 758 12.1 9.7, 14.8 1.8 1.5, 2.2 10.4
303 61 504 12.1 9.2, 15.5 1.8 1.4, 2.3 12.8
90 203 1691 12.0 11.4, 12.5 1.8 1.6, 2.1 7.0
296 87 770 11.2 9.0, 13.9 1.7 1.3, 2.1 10.7
106 145 1286 11.2 10.6, 11.8 1.7 1.4, 2.0 8.3
161 255 2313 11.0 10.5, 11.4 1.7 1.5, 1.9 6.2
301 320 2928 10.9 10.5, 11.3 1.7 1.5, 1.8 5.5
324 52 484 10.7 8.0, 14.0 1.6 1.2, 2.1 13.8
89 139 1356 10.2 9.7, 10.7 1.5 1.3, 1,8 8.4
80 107 1051 10.1 9.5, 10.7 1.5 1.2, 1.8 9.6
361 127 1254 10.1 9.5, 10.6 1.5 1.3, 1.8 8.8
292 51 505 10.0 7.5, 13.2 1.5 1.1, 2.0 14.0
286 232 2326 9.9 9.5, 10.3 1.5 1.3, 1.7 6.5
243 119 1204 9.8 9.3, 10.4 1.5 1.2, 1.8 9.1
244 78 802 9.7 7.6, 12.1 1.5 1.1, 1.8 11.3
320 37 383 9.6 6.8, 13.3 1.5 1.0, 1.9 16.4
85 62 674 9.1 7.0, 11.7 1.4 1.0, 1.7 12.7
251 62 674 9.1 7.0, 11.7 1.4 1.0, 1.7 12.7
43 63 685 9.1 7.0, 11.7 1.4 1.0, 1.7 12.5
77 69 787 8.7 6.8, 11.0 1.3 1.0, 1.6 12.0
317 97 1137 8.5 6.9, 10.4 1.3 1.0, 1.5 10.1
294 115 1366 8.4 7.9, 8.8 1.3 1.0, 1.5 9.3
33 81 963 8.4 6.6, 10.4 1.3 1.0, 1.5 11.1
338 158 1800 8.3 7.9, 8.7 1.2 1.0, 1.5 8.1
193 158 2016 7.8 7.4, 8.1 1.2 1.0, 1.4 7.9
311 160 2043 7.8 7.4, 8.1 1.2 1.0, 1.4 7.9
258 140 1815 7.7 7.3, 8.0 1.2 1.0, 1.4 8.4
105 112 1454 7.7 7.3, 8.0 1.2 0.9, 1.4 9.4
  1. Abbreviations: LBW, Low Birthweight; SIR Standardized Incidence Ratio; CI, Confidence Interval; RSE, Relative Standard Error
  2. a Rate is per 100 live births; b Standard Population of Michigan, 2000 incidence ratios, Michigan, 2004–2006.