In the first group of cases (1963-67) the relationship between histological grade and survival just failed to reach statistical significance over the long term (20 yr) (P = 0.1) but proved significant over 3 yr (P = 0.012).
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The sentences
The association between morphological grade of NHL and survival assessed using long rank statistics over the whole 20 yr period approached significance (P=0.1) (Figure 4).