Multiple comparison testing revealed a significantly greater ED 50 value in older subjects exposed to the red light stimulus ( t = 2.90, p < 0.01), whereas the difference in ED 50 between age groups did not reach statistical significance for the blue light stimulus ( t = 1.75, p = 0.081).
2
0.0810
0.2600
The sentences
Although there was a significant main effect of age on the threshold irradiance required to elicit a 10% constriction response ( F 1,112 = 3.98, p = 0.049), pairwise differences for each wavelength of light failed to reach statistical significance after correcting for multiple comparisons (469 nm, t = 1.12, p = 0.26; 631 nm, t = 1.79, p = 0.074) ( Table 2 ).