Chapter 2

Question 1

Prevalence

Answer 1

the number of all cases currently identified (even if they did not begin recently)

Question 2

Lifetime incidence

Answer 2

the number of all cases ever exhibited of a disorder whether currently or in the past (even if they recovered).

Question 3

World population -
World Stuttering Prevalence-
World Stuttering incidence-
US population overall-
US Stuttering prevalence-
US Stuttering Incidence-

Answer 3

World population -7,250,000,000
World Stuttering Prevalence-50,400,000 /.7%
World Stuttering incidence-362,500,000 / 5%
US population overall- 320,000,000
US Stuttering prevalence-2,240,000 /.7%
US Stuttering Incidence-16,000,000 / 5%

Question 4

prevalence in 21st century

preschool-
school-
lifetime-

Answer 4

preschool-3.46%
school-.83%
lifetime-.72%

Question 5

Familiality and Stuttering Incidence

Majority of studies: % of PWS have familial stuttering

Fewer than % of NFS have familial stuttering

Answer 5

Majority of studies: 30-60% of PWS have familial stuttering

Fewer than 10% of NFS have familial stuttering

Question 6

Why does stuttering prevalence decline with age?

Natural recovery includes ____cases as age ___

New stuttering onsets, however, are _____as age ____

Answer 6

Natural recovery includes more cases as age increases

New stuttering onsets, however, are less frequent as age increases

Question 7

Who stutters: The gender factor

Childhood (near onset):

Adulthood:

Answer 7

Childhood (near onset):
2.1 males to 1 female

Adulthood:
4 males to 1 female

Question 8

Geographical & Cultural Factors

Stuttering has been documented in nearly all ____
Cross-culture stuttering findings are _____

Answer 8

Stuttering has been documented in nearly all geographic areas of the world

Cross-culture stuttering findings are questionable due to methodological problems

Question 9

Race Factor

A common belief:

Recent research of preschoolers: no significant difference between

Answer 9

A common belief: higher incidence of stuttering among African Americans

Recent research of preschoolers: no significant difference between African Americans and European Americans

Question 10

Stuttering and Hearing Impairment

Research: _____among the _______

Informal reports: more __disfluency than _disfluency among the ___

Answer 10

Research: a low incidence (0.05 -0.12%) among the hearing impaired

Informal reports: more manual disfluency than oral disfluency among the deaf

Question 11

Stuttering and Cognitive Impairment

Past research: a high incidence of stuttering among those with ____

Children with ____ have a higher disfluency level, but show low ____ _____ to their stuttering

Answer 11

Past research: a high incidence of stuttering among those with cognitive impairments

Children with Down syndrome have a higher disfluency level, but show low emotional reactivity to their stuttering