I just looked at DS' WPPSI scores (age 4yrs 4mos)

The ceiling scores were:

Information 18 >7:2 99.6%ile
Vocabulary 18 >7:2 99.6%ile
Word Reasoning 18 >7:2 99.6%ile
Block Design 19 7:2 99.9%ile

I have wondered why the 18's were listed as >7:2 and the 19 was 7:2. Does anybody know why that is?