I don't think that Davidson distinguishes between the WPPSI-III and WPPSI-IV. A verbal, FQIQ or Performance > 150 is accepted.

"Standard score 150+ (99.9th percentile) on at least one of the following sections: Verbal, Performance or Full Scale"

I am not sure either how much weight to put in WPPSI-IV scores as early IQs are not stable as aeh has pointed out.

A WPPSI score means something I guess - but what?