Postoperative urinary retention: risk factors, bladder filling rate and time to catheterization: an observational study as part of a randomized controlled trial

Table 3 Time to catheterization/voiding after general or spinal anesthesia, scanned bladder volumes, and bladder filling rates

	N	Mean	Standard deviation	Minimum	Maximum
General anesthesia
Spontaneous
Time (min)	580	282^#	± 117	70	808
Scan volume (mL)	595	412	± 206	0	1000
Rate (mL/h)	569	100	± 66	0	388
Catheter
Time (min)	26	352^#*	± 157	178	710
Scan volume (mL)	31	602	± 216	298	1000
Rate (mL/h)	25	137	± 84	32	317
Spinal anesthesia
Spontaneous
Time (min)	238	273^{^}	± 82	99	712
Scan volume (mL)	238	452	± 224	49	999
Rate (mL/h)	234	107^&	± 63	11	379
Catheter
Time (min)	44	205^^*	± 74	99	397
Scan volume (mL)	52	626	± 179	330	999
Rate (mL/h)	43	203^&	± 94	94	469

N, with missing data, Time = time to catheterization or voiding, Scan volume = scanned bladder volume before voiding or catheterization, Rate = bladder filling rate from start of anesthesia till voiding or catheterization
^#General anesthesia spontaneous (282 min) versus catheterization (352 min), p = 0.032
^{^}Spinal anesthesia spontaneous (273 min) versus catheterization (205 min), p < 0.001
^*Spinal anesthesia (205 min) versus general anesthesia (352 min) with catheterization, p < 0.001
^&Spinal anesthesia bladder filling rate, catheterization (203 mL/h) versus spontaneous (107 mL/h), p = 0.005

ISSN: 2047-0525