Table 2.1

Pulse rates (bpm) before and after diet cola

Caffeine	Before	After
Yes	70	87
Yes	70	92
Yes	75	96
Yes	81	97
Yes	72	78
Yes	80	78
Yes	67	94
Yes	75	90
Yes	64	80
Yes	76	96
No	96	100
No	65	75
No	90	97
No	90	81
No	86	91
No	89	93
No	73	78
No	69	76
No	75	81
No	64	76