Table 1.

Maximum allowable SD for criterion 2

n	Maximum permissible SD (mmHg)
	0.0 _	0.1 _	0.2 _	0.3 _	0.4 _	0.5 _	0.6 _	0.7 _	0.8	0.9
±0	6.95	6.95	6.95	6.95	6.93	6.92	6.91	6.90	6.89	6.88
±1	6.87	6.86	6.84	6.82	6.80	6.78	6.76	6.73	6.71	6.68
±2	6.65	6.62	6.58	6.55	6.51	6.47	6.43	6.39	6.34	6.30
±3	6.25	6.20	6.14	6.06	6.03	5.97	5.89	5.83	5.77	5.70
±4	5.64	5.56	5.49	5.41	5.33	5.25	5.16	5.08	5.01	4.90
±5	4.79	–	–	–	–	–	–	–	–	–

For a mean value of ± 4.2 mmHg, the maximum permissible SD is 5.49 mm Hg.