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| Patient (n) | 45 |
| Age (y) | 29.3 |
| Mean of gestational age (wk) | 27.3 |
| First trimester (No. of patients) | 9 |
| Second trimester (No. of patients) | 24 |
| Third trimester (No. of patients) | 12 |
| Laterality | |
| Left | 17 |
| Right | 28 |
| History of urolithiasis | 18 |
| Symptoms | |
| Renal colic | 36 |
| Fever | 3 |
| Hematuria or pyuria | 9 |
| Irritative symptoms | 18 |
| Stone diagnosed by ultrasound | 18 |
| Mean of stone size on ultrasound (mm) | 7.84 mm |
| Positive urine culture | 6 |
