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The SMOG Readability Test
 
For materials containing > 30 sentences
 
  1. Count off 10 consecutive sentences at the beginning, middle and end of the text.
  2. Count the number of words with 3 or more syllables in the 30-sentence sample.
    Answer:
  3. Use the answer to step 2 to look up the reading grade level in the chart.
 
For materials containing < 30 sentences
 
  1. Count the number of sentences.
  2. Count the number of words with 3 or more syllables in the sample.
  3. Divide the number of sentences in the sample into 30 (ie 30/25) and multiply this number by the number of words from step 2.
    Answer:
  4. Use the answer to step 3 to look up the reading grade level in the chart.

Notes:

  • A sentence is defined as a string of words punctuated with a period, exclamation point, or question mark.
  • Hyphenated words are considered one word.
  • Numbers should be considered as if they were written out (i.e. both "25" and "twenty-five" should be considered to have 3 or more syllables).
  • Proper nouns should be considered.
  • Abbreviations should be considered in their unabbreviated form.
"SMOG" Conversion Chart
 
Words with 3 or more syllables in a 30 sentence sample Approximate Reading Grade Level (+/- 1.5 grades)
0-2
3-6
7-12
13-20
21-30
31-42
43-56
57-72
73-90
91-110
111-132
133-156
157-182
4
5
6
7
8
9
10
11
12
13
14
15
16

Reading level of this material:  th grade (± 1.5 grades).

Simplified Measure of Gobbledygoop (SMOG):
McLaughlin, G., SMOG grading: A new readability formula. Journal of Reading, 1969. 12(8): p. 639-646.

Reading Level Reference:
Readability testing in cancer communications : methods, examples, and resources for improving the readability of cancer messages and materials, National Cancer Institute (U.S.). Office of Caner Communications, Bethesda MD. Department of Health, Education, and Welfare, Public Health Services, National Institutes of Health, National Cancer Institute, 1979.

National Cancer Institute, Making health communication programs work. NIH Publication No. 02-5145 ed. 2001, Rockville, Maryland: U.S. Department of Health and Human Services.

Fry Method of Readability Assessment:
Fry, E., Fry's readability graph: clarifications, validity, and extensions to level 17. Journal of Reading, 1977. 21: p. 242-252.

Fry, E., Elementary reading instruction. 1977: McGraw-Hill Companies.

Doak, C.C., L.G. Doak, J.H. Root, Teaching patients with low literacy skills. 2nd ed. 1996, Philadelphia: Lippincott Company.

 

RELATED LINKS

PRC Reports and Tools
Reviewed Materials Directory
Current Public Health Message
List of Reviewed Materials
Review Your Own PA Material
Reading Level Tool

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