Table 1 Characteristics of the study population (n = 209)

Demography data

 Mean age (years)

36.0(23.0,53.0)

 Male (%)

135(64.6%)

Hospitalization data

 Onset time (days)

4.0(2.0,7.0)

 Hospitalized days

17.0(9.5,30.5)

 Admission to ICU (days)

6.0(3.0,13.0)

 Days of critical condition (days)

9.0(4.0,18.8)

 Number of rescuing

0.0(0.0,1.0)

 Days of advanced care (days)

6.0(3.0,12.0)

 Days of primary care (days)

12.0(6.0,22.5)

Clinical data

 Cerebrospinal fluid pressure ≥ 180mmH₂O

109(52.4%)

 Cerebrospinal fluid pressure ≥ 400mmH₂O

32(15.4%)

 White blood cell abnormality in CSF

137(65.9%)

 Total protein abnormality in CSF

137(65.6%)

 Abnormal imaging

78(38.6%)

 Abnormal electroencephalogram

65(32.8%)

 Complications

118(56.5%)

Causative agent

 Viral

147(70.3%)

 Bacterial

36(17.2%)

 Fungal

10(4.8%)

 Tubercular

16(7.7%)