Table 3. Patient characteristics in MSNE.
| Variable | MSNE patients | Low osmolality group | High osmolality group | p-value | |
|---|---|---|---|---|---|
| Patients number | 41 (100.0) | 12 (29.3) | 29 (70.7) | ||
| Sex (boy/girl) | 16/25 | 5/7 | 11/18 | 0.231a | |
| Age (y) | 7.7±2.1 | 8.4±2.5 | 7.5±19 | 0.202c | |
| Height (cm) | 127.0±13.7 | 132.5±15.3 | 124.9±12.6 | 0.116c | |
| Weight (kg) | 31.0±12.2 | 32.7±12.6 | 30.3±12.2 | 0.562d | |
| BMI (kg/m2) | 18.5±3.7 | 17.6±3.2 | 18.8±3.8 | 0.378c | |
| Gestational age (wk) | 39.1±1.3 | 38.8±1.0 | 39.3±1.4 | 0.127d | |
| Birth body weight (kg) | 3.3±0.5 | 3.4±0.4 | 3.3±0.5 | 0.431c | |
| Follow-up period (mo) | 8.0±5.0 | 7.8±6.1 | 8.1±4.5 | 0.436d | |
| First-morning urine osmolality (mOsm/L) | 877.7±191.5 | 637.8±148.5 | 976.9±94.1 | <0.001c | |
| Constipation on KUB | 13 (31.7) | 4 (33.3) | 9 (31.0) | >0.999b | |
| Frequency volume chart | |||||
| Daytime MVV (mL) | 184.5±116.0 | 210.4±171.1 | 173.4±84.2 | 0.362c | |
| First morning VV (mL) | 162.3±92.3 | 176.8±120.0 | 155.9±79.2 | 0.538c | |
| Total urine volume (mL) | 562.0±246.1 | 565.0±335.8 | 560.7±206.8 | 0.465d | |
| Uroflowmetry | |||||
| Qmax (mL/s) | 20.5±5.7 | 21.2±6.9 | 20.2±5.2 | 0.599c | |
| VV (mL) | 159.7±88.2 | 194.7±137.1 | 144.7±53.0 | 0.244c | |
| PVR (mL) | 14.2±10.6 | 16.4±10.3 | 13.3±10.7 | 0.392c | |
| EBC (mL) | 261.9±63.7 | 281.9±75.2 | 253.6±57.7 | 0.200c | |
| MVV/EBC (%) | 63.3±29.1 | 62.8±30.5 | 63.4±29.0 | 0.954c | |
| VV/EBC (%) | 60.7±24.8 | 65.0±33.6 | 58.8±20.5 | 0.716d | |
Values are presented as number (%) or mean±standard deviation.
MSNE, monosymptomatic nocturnal enuresis; BMI, body mass index; KUB, kidney, ureter and bladder X-ray; MVV, maximum voided volume; VV, voided volume; PVR, post-void residual volume; EBC, estimated bladder capacity.
a:Chi-square test.
b:Fisher’s exact test.
c:t-test.
d:Mann–Whitney test.
p<0.05 was assumed as statistically significant.