Table 1
Characteristics of sample, household population aged 7 to 15 with complete data on measures of school functioning, 1998/1999 National Longitudinal Survey of Children and Youth

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Characteristic Total No chronic condition Asthma No asthma, but other chronic condition Statistical comparison
Low Moderate Severe
Total number 8,914 5,626 513 438 482 1,855  
Child
Mean age† (standard deviation) 10.8 (2.6) 10.7 (2.7)‡ 11.0 (2.6) 10.8 (2.6) 10.8 (2.5) 11.1 (2.6)§ F = 7.80*
Female (%) 49.6 52.4 43.1 41.8 42.3 47.1 chi-squared= 176.18*
Family
Mean maternal age† (standard deviation) 38.5 (5.53) 38.5 (5.5)‡ 38.3 (5.3)‡ 38.6 (5.3) 38.0 (5.4)§ 38.9 (5.7)‡ F = 5.74*
Female-headed (%) 15.3 14.6 16.8 17 17.4 16.2 chi-squared= 38.84*
Maternal education
Less than secondary graduation (%)
 13.1 13.4 13.1 11.4 11.8 13 chi-squared=100.68*
Secondary graduation (%)
 19.9 21.1 17.4 17.1 17.4 18.3  
Some postsecondary (%)
 28.4 27.7 29.8 29.5 32 28.8  
Postsecondary graduation (%)
 38.6 37.8 39.8 42 32.8 39.9  
Mother not currently employed (%) 6.6 6.6 7.5 8.1 4.6 6.4 chi-squared=5.25
Mother not employed prior year (%) 18.7 18.8 20.1 17.9 19.9 18 chi-squared=7.57
Income adequacy 3.66 (0.96) 3.66 (0.96) 3.65 (0.96) 3.68 (0.94) 3.59 (0.98) 3.67 (0.94) F=0.58
Child health
Health status
Excellent (%)
 53.4 62.5 44.3 32 13.7 43.8 chi-squared=1543.27*
Very good (%)
 33 29.8 41.9 46 42.1 35  
Good/Fair/Poor (%)
 13.6 7.8 13.8 22.2 44.2 21.1  
Chronic condition (%) 29.7 0 39.6 58.2 69.7 100  
School functioning
Days absent (%)
0
 39 41.8 37.6 30.6 28 35.4 chi-squared=268.94*
1 to 3
 46 44.9 47.6 53.9 50.6 45.7  
4 to 6
 9.6 9 9.2 10.3 12.2 10.8  
7 or more
 5.5 4.3 5.7 5.3 9.1 8.1  
Use of educational services (%) 6.6 2.6 6.3 9.1 11.2 17 chi-squared=1164.24*
* p < 0.05; significantly different categories for continuous variables have different superscripted symbols
† continuous variable
Source: 1998/1999 National Longitudinal Survey of Children and Youth.