data ra;
    input group $ sjc tjc pta pha @@;
    datalines;
    Placebo   -5  -9  -14  -21 Placebo   -3  -7   -5  -25
    Placebo   -7  -4  -28  -15 Placebo   -3   0  -17   -6
    Placebo   -4  -1   -5    5 Placebo    0   5   -8  -11
    Placebo   -3   1   15    0 Placebo    2   6   15   27
    Placebo   -1  -4  -11   -8 Placebo    0   1    8   12
    Placebo    2  -2    6   -9 Placebo    8   2   11   33
    Therapy   -7  -1  -21   -9 Therapy   -6 -11  -36  -12
    Therapy   -3  -7  -14  -21 Therapy   -4   2   10  -10
    Therapy  -11  -4  -28  -45 Therapy   -4  -1  -11  -23
    Therapy   -3  -1   -7  -15 Therapy   -5  -9  -36  -15
    Therapy   -4  -9  -35  -32 Therapy  -11 -10  -47  -31
    Therapy    3  -1    6   17 Therapy   -1  -9   -5  -27
    ;