Sentence:  Boys 32 , 23 , 31 , 17 , 30 , 19 , and 24 had `` same schedule '' at Onset and Completion ; thus <WSD>early</WSD> forecasting of the pubescent stage would appear possible for only seven boys . 
Meaning of the word marked with <WSD> tags:  at or near the beginning of a period of time or course of events or before the usual or expected time