College Football Concussion Study                      1
                                                 13:25 Sunday, January 9, 2000

                         TABLE 1 OF O_PLAY BY ACTION
                         CONTROLLING FOR TEAM=Offense

                     O_PLAY     ACTION

                     Frequency|
                     Percent  |
                     Row Pct  |
                     Col Pct  |Tackle  |Block   |  Total
                     ---------+--------+--------+
                     Rushing  |    125 |    129 |    254
                              |  33.78 |  34.86 |  68.65
                              |  49.21 |  50.79 |
                              |  59.52 |  80.63 |
                     ---------+--------+--------+
                     Passing  |     85 |     31 |    116
                              |  22.97 |   8.38 |  31.35
                              |  73.28 |  26.72 |
                              |  40.48 |  19.38 |
                     ---------+--------+--------+
                     Total         210      160      370
                                 56.76    43.24   100.00


                  STATISTICS FOR TABLE 1 OF O_PLAY BY ACTION
                         CONTROLLING FOR TEAM=Offense

                  Estimates of the Relative Risk (Row1/Row2)

                                                       95%
            Type of Study           Value      Confidence Bounds
            ------------------------------------------------------
            Case-Control            0.353       0.219      0.571
            Cohort (Col1 Risk)      0.672       0.569      0.793
            Cohort (Col2 Risk)      1.900       1.373      2.630


            Sample Size = 370

                      College Football Concussion Study                      2
                                                 13:25 Sunday, January 9, 2000

                         TABLE 2 OF O_PLAY BY ACTION
                         CONTROLLING FOR TEAM=Defense

                     O_PLAY     ACTION

                     Frequency|
                     Percent  |
                     Row Pct  |
                     Col Pct  |Tackle  |Block   |  Total
                     ---------+--------+--------+
                     Rushing  |    216 |     61 |    277
                              |  60.85 |  17.18 |  78.03
                              |  77.98 |  22.02 |
                              |  77.70 |  79.22 |
                     ---------+--------+--------+
                     Passing  |     62 |     16 |     78
                              |  17.46 |   4.51 |  21.97
                              |  79.49 |  20.51 |
                              |  22.30 |  20.78 |
                     ---------+--------+--------+
                     Total         278       77      355
                                 78.31    21.69   100.00


                  STATISTICS FOR TABLE 2 OF O_PLAY BY ACTION
                         CONTROLLING FOR TEAM=Defense

                  Estimates of the Relative Risk (Row1/Row2)

                                                       95%
            Type of Study           Value      Confidence Bounds
            ------------------------------------------------------
            Case-Control            0.914       0.492      1.697
            Cohort (Col1 Risk)      0.981       0.862      1.116
            Cohort (Col2 Risk)      1.074       0.658      1.752


            Sample Size = 355