Table 1.

Summary of reference serum titers in logarithm base 4 scale.

Complement	Counting Method	Mean Titer	Standard Deviation	Minimum	Maximum	Number
With	Manual	5.02	0.215	4.65	6.01	136
	Automatic	4.97	0.204	4.41	5.69	136
Without	Manual	4.21	0.297	3.67	5.15	136
	Automatic	4.17	0.276	3.56	5.11	136