Sentence:  The <WSD>correlation</WSD> ( Table 2 ) between onset age and completion age was + .50 , and that between onset age and Span was - .10 . 
Meaning of the word marked with <WSD> tags:  a statistic representing how closely two variables co-vary; it can vary from -1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation)