Table 1.

Age distribution, length of follow-up, and probability of conversion from lower risk to abnormal TCD

Age, y
No. children
Median LOF (inner quartile range)
Converters*(% within each group)
2-4   243   17.0 (29.5)   31 (12.8)† 
4-6   233   14.7 (28.6)   36 (15.5)  
6-8   196   23.3 (28.8)   17 (8.7)  
8-10   183   15.4 (30.1)   15 (8.2)  
10-12   156   25.6 (26.0)   6 (3.9)  
12-14   112   13.3 (18.9)   6 (5.4)  
14-16   85   11.0 (10.3)   3 (3.5)  
16+   5   6.9 (1.5)   0 (0.0)  
Total
 		 1213
 		 15.6 (27.4)
 		 114 (9.4)
 
Age, y
No. children
Median LOF (inner quartile range)
Converters*(% within each group)
2-4   243   17.0 (29.5)   31 (12.8)† 
4-6   233   14.7 (28.6)   36 (15.5)  
6-8   196   23.3 (28.8)   17 (8.7)  
8-10   183   15.4 (30.1)   15 (8.2)  
10-12   156   25.6 (26.0)   6 (3.9)  
12-14   112   13.3 (18.9)   6 (5.4)  
14-16   85   11.0 (10.3)   3 (3.5)  
16+   5   6.9 (1.5)   0 (0.0)  
Total
 		 1213
 		 15.6 (27.4)
 		 114 (9.4)
 

LOF indicates length of follow-up.

*

Converters are defined as children with 2 or more TCD examinations, with normal or conditional first TCD and with subsequent test with abnormal result.

†

Significant difference in median follow-up time across age (P < .0001).

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