PCA+ ketamine  PCA p-value+ Days with pain score ≥ 8 146/235 (62%)  133/240 (55%) 0.113 Number of painful sites ≥ 2=54% ≥ 2=45% 0.060 ≥ 3=20% ≥ 3=7% 0.0001 Received Antiemetic 24/240 (10%) 33/241 (14%) 0.228 Received Antihistamine 79/240 (33%) 63/242 (26%) 0.060 +McNemars test

Table 3: Hospitalization characteristics and severity by patient days (n=242 patient days).