We have obtained optical turbulence profiles consisting of values for the statistical parameter Cn-squared derived from stellar scintillations. Each profile consists of the values for Cm-squared determined for a collection of seven vertical positions (2-20km). These determinations are based upon measurements comprising the spatial spectrum of intensity scintillations observed across wavefronts arriving from a given star during a two-minute period of time. The profiles in this data base were obtained from two different locations over a period of several years; 1) LAOTFJ Advanced Optical Test Facility at Verona, New York; 2) LAMOSJ ARPA Maui Optical Station at Maui, Hawaii. We have time-analyzed the statistical fluctuations in the Cn-squared values obtained. This analysis has revealed that the turbulence fluctuations are statistically homogeneous for only relatively short periods of time. We shall report on several systematic changes in the statistical properties which we have founa to occur over longer periods of time.