Normal QT Intervals
                           ===================
                     Normal                  Upper Limit of Normal
             --------------------------    ------------------------------
HR/minute       Man/Child       Woman           Men/Child       Woman
===============================================================================
40              .449            .461            .491            .503
43              .438            .45             .479            .491
46              .426            .438            .466            .478
48              .42             .432            .46             .471
50              .414            .425            .453            .464
52              .407            .418            .445            .456
54.5            .4              .411            .438            .449
57              .393            .404            .43             .441
60              .386            .396            .422            .432
63              .378            .388            .413            .423
66.5            .37             .38             .404            .414
70.5            .361            .371            .395            .405
75              .352            .362            .384            .394
80              .342            .352            .374            .384
86              .332            .341            .363            .372
92.5            .321            .33             .351            .36
100             .31             .318            .338            .347
109             .297            .305            .325            .333
120             .283            .291            .31             .317
133             .268            .276            .294            .301
150             .252            .258            .275            .282
172             .234            .24             .255            .262
[Source:  Mariott.]