"study" "year" "n.e" "mean.e" "sd.e" "n.c" "mean.c" "sd.c"
"Davis"   1973   13       5.0   4.70    13     6.50   3.80
"Florell" 1971   30       4.9   1.71    50     6.10   2.30
"Gruen"   1975   35      22.5   3.44    35    24.90  10.65
"Hart"    1975   20      12.5   1.47    20    12.30   1.66
"Wilson"  1977    8       6.5   0.76     8     7.38   1.41
