You will be shown the abstract of a medical clinical trial report. Your task is to extract all the findings from this report into a JSON array. Each finding should contain the following five elements:

- Intervention: The medical intervention being tested. This should be a text span copied from the input passage.
- Comparator: The baseline against which the intervention is being evaluated. This should be a text span copied from the input passage. If no comparator is reported, set to `null`.
- Outcome: The medical outcome whose effect is being measured. This should be a text span copied from the input passage.
- Effect: The effect of the intervention on the outcome, relative to the comparator. The effect should be one of the following three values: ("significantly increased", "significantly decreased", "no significant difference").
- Evidence: The evidence for the effect. This should be a text span copied from the input passage.

Please format your output as a JSON array. Each entry in the output should be an array containing the 5 elements listed above, in the following order: [<intervention>, <comparator>, <outcome>, <effect>, <evidence>].

For example, an output with two findings might read:
```
[["aspirin", "placebo", "headache severity", "significantly decreased", "Mean headache severity was significantly decreased in the aspirin group compared to the placebo group (p < 0.05)."], ["aspirin", "placebo", "weight loss", "no significant difference", "We did not observe any difference in weight loss between the group given aspirin relative to the control group"]]
```

There are 2 finding(s) in the abstract below. Please extract them. Output only the JSON array with these 2 findings. Do not include any additional text.

Abstract:
ABSTRACT.BACKGROUND:: Appropriate pain management is needed during the post-partum hospitalization period for preventing cesarean section (CS) related complications. Protocols of post-partum pain management should be planned based on the facilities of each center or region. The aim of current study was to compare the analgesic efficacy of oral methadone and intra muscular (IM) pethidine which the latter was routinely used in our center in post cesarean pain treatment.

ABSTRACT.MATERIALS AND METHODS:: In this prospective double-blind clinical trial, women who were candidate for cesarean section were selected and randomized into two groups. All patients routinely received a single IM pethidine dose (50 mg) after CS in the recovery room. One group of patients received 0.7 mg/kg pethidine every 6 hour IM, and another group received 0.07 mg/kg oral methadone every 6 hour. Severity of pain assessed using visual analogue scale (VAS) score in 6, 12, 18 and 24 hour after surgery.

ABSTRACT.RESULTS:: Pain severity in methadone group at 6, 12, 18 and 24 hour post operation were 6.4 ± 0.9, 3.4 ± 0.8, 1.9 ± 1.1, 0.5 ± 0.5 (p < 0.05) and for patients in pethidine group were 6.6 ± 0.8, 3.4 ± 0.9, 2.1 ± 1.0 and 0.5 ± 0.5 (p < 0.05), respectively (Mean ± SD). Between groups differences in each follow up time were not statistically significant. There was no difference between groups in terms of complications and supplementary analgesic use.

ABSTRACT.CONCLUSION:: Considering the similar analgesic effects of methadone and pethidine, satisfaction of patients and nursing system with methadone use and the cost benefit of methadone, it can be recommended to use methadone for post operative pain relieving.

Findings:
[["0.7 mg/kg pethidine every 6 hour IM", "0.07 mg/kg oral methadone every 6 hour.", "Pain severity", "no significant difference", "Pain severity in methadone group at 6, 12, 18 and 24 hour post operation were 6.4 \u00b1 0.9, 3.4 \u00b1 0.8, 1.9 \u00b1 1.1, 0.5 \u00b1 0.5 (p \u0026lt; 0.05) and for patients in pethidine group were 6.6 \u00b1 0.8, 3.4 \u00b1 0.9, 2.1 \u00b1 1.0 and 0.5 \u00b1 0.5 (p \u0026lt; 0.05), respectively (Mean \u00b1 SD). Between groups differences in each follow up time were not statistically significant."], ["0.7 mg/kg pethidine every 6 hour IM", "0.07 mg/kg oral methadone every 6 hour.", "terms of complications and supplementary analgesic use", "no significant difference", "There was no difference between groups in terms of complications and supplementary analgesic use."]]