Table 3.

Classification and sex according to groups

Variables	Group 1 (RIA‐positive and ELISA‐positive)	Group 2 (RIA‐positive and ELISA‐negative)	Group 3 (RIA‐negative and ELISA‐positive)	Group 4 (RIA‐negative and ELISA‐negative)	P‐value
n	39	6	8	25	–
Classification					0.021
Acute type (%)	40.8	4.1	14.3	40.8
Slowly progressive type (%)	65.5*	13.8	3.4	17.2*
Male (%)	35.9	16.7	37.5	36.0	0.817
Acute type (%)	35.0	50.0	42.9	45.0	0.920
Slowly progressive type (%)	36.8	0	0	0	0.183

Data are presented as a number, percent and mean (SD). *P < 0.05 (vs the acute type). ELISA, enzyme‐linked immunosorbent assay; RIA, radioimmunoassay.