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| Ritodrine (n = 101) | Mg sulphate (n = 101) | Nifedipine (n = 101) | P - value1 | P - value2 | P - value3 | |
| Age (years): |
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| Mean ± SD | 24.54 ± 4.83 | 24.47 ± 4.97 | 25.44 ± 4.83 | 0.879 | 0.175 | 0.137 | |
| Range | 16.0 - 39.0 | 12.0 - 38.0 | 17.0 - 36.0 | ||||
| Parity: |
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| Mean ± SD | 1.28 ± 1.69 | 1.10 ± 1.48 | 1.34 ± 1.47 | 0.463 | 0.375 | 0.082 | |
| Range | 0.0 - 10.0 | 0.0 - 6.0 | 0.0 - 9.0 | ||||
| Abortions: |
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| Mean ± SD | 0.46 ± 0.89 | 0.45 ± 0.78 | 0.50 ± 0.77 | 0.599 | 0.274 | 0.541 | |
| Range | 0.0 - 4.0 | 0.0 - 4.0 | 0.0 - 3.0 | ||||
| Gestational age: (weeks) |
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| Mean ± SD | 31.68 ± 2.57 | 31.07 ± 2.59 | 31.39 ± 2.66 | 0.093 | 0.555 | 0.283 | |
| Range | 25.0 - 36.0 | 26.0 - 35.0 | 24.0 - 34.0 | ||||