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| control | DHβE | SST | nifedipine | |||||
| x ± SD, s | incidence | x ± SD, s | incidence | x ± SD, s | incidence | x ± SD, s | incidence | |
| P5–6 | 68.92±5.70 | 6(6) | na | 0(6) | na | 0(6) | na | 0(6) |
| P8–9 | 107.78±55.25 | 6(6) | 143.26±53.49 | 6(6) | 107.41±58.15 | 6(6) | 130.71±8.89 | 1(6) |
| P12–14 | 33.53±15.30 | 6(6) | 30.86±18.91 | 6(6) | 5.00±1.06 | 6(6) | 27.93±79.65 | 2(6) |
| P15–16 | 48.19±30.62 | 2(6) | 27.78±22.27 | 1(6) | 2.67±1.29 | 6(6) | na | 0(6) |
