Table 4. Patient characteristics in NMSNE.
| Variable | NMSNE patients | Low osmolality group | High osmolality group | p-value | |
|---|---|---|---|---|---|
| Patients number | 58 (100.0) | 26 (44.8) | 32 (55.2) | ||
| Sex (boy/girl) | 30/28 | 16/10 | 14/18 | 0.178a | |
| Age (y) | 6.8±2.0 | 7.5±2.3 | 6.3±1.6 | 0.090c | |
| Height (cm) | 119.5±12.8 | 123.4±15.4 | 116.3±9.2 | 0.046b | |
| Weight (kg) | 26.1±9.5 | 28.6±11.5 | 24.0±7.2 | 0.226c | |
| BMI (kg/m2) | 17.7±3.1 | 18.0±3.4 | 17.4±2.8 | 0.542c | |
| Gestational age (wk) | 38.4±2.2 | 38.5±2.8 | 38.4±1.6 | 0.356c | |
| Birth body weight (kg) | 3.1±0.5 | 3.1±0.6 | 3.1±0.5 | 0.787b | |
| Follow-up period (mo) | 7.6±5.2 | 7.8±5.9 | 7.5±4.7 | 0.718c | |
| First-morning urine osmolality (mOsm/L) | 822.0±261.3 | 583.9±159.2 | 1,015.5±137.7 | <0.001c | |
| Constipation on KUB | 25 (43.1) | 13 (50.0) | 12 (37.5) | 0.339a | |
| Frequency volume chart | |||||
| Daytime MVV (mL) | 146.8±74.0 | 172.3±87.9 | 125.4±52.4 | 0.014c | |
| First morning VV (mL) | 139.0±92.3 | 179.6±113.9 | 106.3±52.4 | 0.007c | |
| Total urine volume (mL) | 611.0±331.6 | 743.5±377.7 | 496.2±237.1 | 0.002c | |
| Uroflowmetry | |||||
| Qmax (mL/s) | 18.6±7.2 | 19.3±7.8 | 17.9±6.8 | 0.516c | |
| VV (mL) | 127.4±53.0 | 124.3±61.5 | 130.0±45.6 | 0.349c | |
| PVR (mL) | 13.1±12.1 | 14.6±14.4 | 11.7±9.9 | 0.590c | |
| EBC (mL) | 235.1±60.5 | 253.8±69.2 | 219.9±48.3 | 0.090c | |
| MVV/EBC (%) | 59.9±30.3 | 67.8±35.6 | 48.2±22.2 | 0.014b | |
| VV/EBC (%) | 56.1±22.3 | 50.4±23.5 | 61.0±20.5 | 0.029c | |
Values are presented as number (%) or mean±standard deviation.
NMSNE, non-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:t-test.
c:Mann–Whitney test.
p<0.05 was assumed as statistically significant.