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Table 2 Summary of end points analysed in drain versus no-drain groups

From: The impact of routine open nonsuction drainage on fluid accumulation after thyroid surgery: a prospective randomised clinical trial

Measurement parameter Drain group No drain group P-value
Mean length of postoperative stay (days) 2.3 2.1 0.477
Mean pain score (maximum = 10) 2.9 3.0 0.803
Median postoperative analgesic requirements as per World Health Organisation pain ladder Level II Level II 0.747
Mean fluid accumulation on ultrasound (ml)    
24 hours 16.4 25.1 0.005
48 hours 18.6 25.7 0.026
Complications (n)    
Symptoms hypocalcaemia 4 5 0.444
Shortness of breath 0 0 -
Wound infection 4 1 0.154
Postthyroidectomy bleed 0 0 -
Haematoma requiring drainage 0 1 -
Other (RTI) 0 1 -
Mean satisfaction with scar (maximum = 10) 8.0 8.2 0.540
Satisfaction with overall hospital stay (maximum = 10) 8.6 8.6 0.992
  1. Significantly more fluid accumulation was observed in the no-drain group at both 24 and 48 hours (two-paired Student’s t-test and Fisher’s exact test).