PD without intraperitoneal drainage was associated with an increase in the number of complications per patient [ 1 ( 0-2 ) vs 2 ( 1-4 ) , P = 0.029 ] ; an increase in the number of patients who had at least 1 grade 2 complication [ 35 ( 52 % ) vs 47 ( 68 % ) , P = 0.047 ] ; and a higher average complication severity [ 2 ( 0-2 ) vs 2 ( 1-3 ) , P = 0.027 ] .