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Table 2 Number and percent of observations disaggregated by years with enrollment and NME data

From: Examining the spatiotemporal evolution of vaccine refusal: nonmedical exemptions from vaccination in California, 2000–2013

Years School(n) School(%) BG(n) BG(%) Tract(n) Tract(%) SD(n) SD(%)
1 653 6.84 267 3.51 111 1.99 11 1.34
2 411 4.31 198 2.60 69 1.24 7 0.85
3 321 3.36 151 1.98 68 1.22 5 0.61
4 323 3.38 164 2.15 64 1.15 4 0.49
5 250 2.62 148 1.94 70 1.26 2 0.24
6 268 2.81 141 1.85 79 1.42 5 0.61
7 241 2.53 133 1.75 61 1.09 5 0.61
8 278 2.91 163 2.14 83 1.49 5 0.61
9 289 3.03 201 2.64 100 1.79 4 0.49
10 280 2.93 202 2.65 111 1.99 5 0.61
11 237 2.48 185 2.43 100 1.79 6 0.73
12 297 3.11 234 3.07 142 2.55 11 1.34
13 695 7.28 533 7.00 340 6.10 49 5.98
14 5000 52.39 4892 64.27 4177 74.92 701 85.49
All 9543 100 7612 100 5575 100 820 100
  1. Values are for Schools, Block Groups (BG), Tracts, and School Districts (SD). The row labeled All contains the total number of observations with at least one year of data within the study period (e.g., over 2000–2013, 9543 distinct schools reported at least one year of enrollment and exemption data). The number of observations (n) values represent counts (e.g., 653 schools reported only one year of data during the study period). The percent values represent the percent of All observations for that level of aggregation (e.g., 4.31% of the 9543 schools reported data for only two years of the study period)