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Excerpted from AIDSQuest: HIV/AIDS Survey Library, Horizons Program, 2008, Washington, DC: Population Council. (More on AIDSQuest)

It is a good idea for every survey's literacy level to be evaluated, particularly when working with low-literacy populations. Literacy levels are usually measured via number of syllables in words used, as well as complexity of sentence structure. Literacy levels are categorized by grade level5th or 6th grade is typically considered the goal for a document utilized by a low literacy population. The "SMOG" is one commonly used literacy evaluation tool.

(For a more detailed description of the SMOG literacy evaluation tool, see Doak, C., L. Doak, J. Root. 1995. Teaching Patients with Low Literacy Level Skills. New York: J.B. Lippincott Co.)

The SMOG readability formula
To calculate the SMOG reading grade level, begin with the entire written work that is being assessed, and follow these four steps:

  1. Count off 10 consecutive sentences near the beginning, in the middle, and near the end of the text.
  2. From this sample of 30 sentences, circle all of the words containing three or more syllables (polysyllabic), including repetitions of the same word, and total the number of words circled.
  3. Estimate the square root of the total number of polysyllabic words counted. This is done by finding the nearest perfect square, and taking its square root.
  4. Finally, add a constant of three to the square root. This number gives the SMOG grade, or the ending grade level that a person must have reached if he or she is to fully understand the text being assessed.

A few additional guidelines will help to clarify these directions:

  • A sentence is defined as a string of words punctuated with a period (.), an exclamation point (!), or a question mark (?).
  • Hyphenated words are considered as one word.
  • Numbers which are written out should also be considered, and if in numeric form in the text, they should be pronounced to determine if they are polysyllabic.
  • Proper nouns, if polysyllabic should be counted, too.
  • Abbreviations should be read as unabbreviated to determine if they are polysyllabic.

Not all pamphlets, fact sheets, or other printed materials contain 30 sentences. To test a text that has fewer than 30 sentences:

  1. Count all of the polysyllabic words in the text.
  2. Count the number of sentences.
  3. Find the average number of polysyllabic words per sentence as follows:

average =  

Total # of polysyllabic words

Total # of sentences

  1. Multiply that average by the number of sentences short of 30.
  2. Add that figure on to the total number of polysyllabic words.
  3. Find the square root and add the constant of 3.

Perhaps the quickest way to administer the SMOG grading test is by using the SMOG conversion table. Simply count the number of polysyllabic words in your chain of 30 sentences and look up the approximate grade level on the chart.

An example of how to use the SMOG readability formula and the SMOG conversion table is provided below. (Polysyllabic words are in bold, blue typeface. The number in brackets before the sentence is the sentence number.)

Example using the SMOG readability formula:

[1] In Controlling Cancer—You Make A Difference

[2] The key is ACTION. [3] You can help protect yourself against cancer. Act promptly to:

[4] Prevent some cancers through simple changes in lifestyle.

[5] Find out about early detection tests in your home.

[6] Gain peace of mind through regular medical checkups.

Cancers you should know about

[7] Lung Cancer is the number one cancer among men, both in the number of new cases each year (79,000) and deaths (70,500). [8] Rapidly increasing rates are due mainly to cigarette smoking. [9] By not smoking, you can largely prevent lung cancer. [10] The risk is reduced by smoking less, and by using lower tar and nicotine brands. But quitting altogether is by far the most effective safeguard. The American Cancer Society offers Quit Smoking Clinics and self-help materials.

Colorectal Cancer is second in cancer deaths (25,100) and third in new cases (49,000). When it is found early, chances of cure are good. A regular general physical usually includes a digital rectal examination of the rectum and a guaiac slide test of a stool specimen to check for invisible blood. Now there are also Do-It-Yourself Guaiac Slides for home use. Ask your doctor about them. After you reach the age of 49, your regular check-up may include a "Procto," in which the rectum and part of the colon are inspected through a hollow, lighted tube.

[11] Prostate Cancer is second in the number of new cases each year (57,000) and third in deaths (20,600). [12] It occurs mainly in men over 60. [13] A regular rectal exam of the prostate by your doctor is the best protection.

A Check-up Pays off
[14] Be sure to have a regular, general physical, including an oral exam. [15] It is your best guarantee of good health.

How Cancer Works
[16] If we know something about how cancer works, we can act more effectively to protect ourselves against the disease. Here are the basics:

[17] 1: Cancer spreads; time counts—Cancer is uncontrolled growth of abnormal cells. [18] It begins small and if unchecked, spreads. [19] If detected in an early, local stage, the chances for cure are best.

[20] 2. Risk increases with age—This is not a reason to worry, but a signal to have more regular thorough physical check-ups. Your doctor or clinic can advise you on what tests to get and how often they should be performed.

3. What you can do—Don't smoke and you will sharply reduce your chances of getting lung cancer. Avoid too much sun, a major cause of skin cancer. Learn cancer's Seven Warning Signals, listed on the back of this leaflet, and see your doctor promptly if they persist. Pain usually is a late symptom of cancer; don't wait for it.

Unproven remedies
Beware of unproven cancer remedies. They may sound appealing, but they are usually worthless. Relying on them can delay good treatment until it is too late. [21] Check with your doctor or the American Cancer Society.

More Information
[22] For more information of any kind about cancer—free of cost—contact your local Unit of the American Cancer Society.

Know Cancer's Seven Warning Signals
[23] 1. Change in bowel or bladder habits.
[24] 2. A sore throat that does not heal.
[25] 3. Unusual bleeding or discharge.
[26] 4. Thickening or lump in breast or elsewhere.
[27] 5. Indigestion or difficulty in swallowing.
[28] 6. Obvious change in wart or mole.
[29] 7. Nagging cough or hoarseness.

[30] If you have a warning signal, see your doctor.

* This pamphlet is from the American Cancer Society

We have calculated the reading grade level for this example. Compare your results to ours, then check both with the SMOG conversion table:

Readability Test Calculations

Total number of polysyllabic words

= 38

Nearest perfect square

= 36

Square root

= 6

Constant

= 3

SMOG reading grade level

= 9

 

 
 
 
 
 
 
 

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