Knowledge of CVOs

Good

Average

Low

Location

199 (62.4%)

83 (26%)

37 (11.6%)

Clinical manifestations

6 (1.2%)

186 (58.3%)

127 (39.8%)

Favorable factors

88 (27.6%)

135 (42.3%)

96 (30.1%)

Preventative measures

104 (32.6%)

112 (35.1%)

103 (32.3%)