You will be provided with a reference and some statements. Please determine whether each statement is 'supported', 'unsupported', or 'unknown' with respect to the reference. Please note:
First, assess whether the reference contains any valid content. If the reference contains no valid information, such as a 'page not found' message, then all statements should be considered 'unknown'.
If the reference is valid, for a given statement: if the facts or data it contains can be found entirely or partially within the reference, it is considered 'supported' (data accepts rounding); if all facts and data in the statement cannot be found in the reference, it is considered 'unsupported'.

You should return the result in a JSON list format, where each item in the list contains the statement's index and the judgment result, for example:
[
    {
        "idx": 1,
        "result": "supported"
    },
    {
        "idx": 2,
        "result": "unsupported"
    }
]

Below are the reference and statements:
<reference>
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Ray ID: a3bee0a3f847e15f
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</reference>

<statements>
1. A meta-analysis of 34 double-blind, randomized, placebo-controlled trials encompassing 2,028 participants demonstrated that oral magnesium supplementation at a median dose of 368 mg/day for a median duration of 3 months significantly lowered systolic blood pressure by 2.00 mmHg (95% CI [0.43, 3.58]) and diastolic blood pressure by 1.78 mmHg (95% CI [0.73, 2.82])
2. These hemodynamic changes were accompanied by an increase in circulating serum magnesium of 0.05 mmol/L
3. Restricted cubic spline modeling indicated that a minimum dose of 300 mg/day for at least one month is required to elevate serum magnesium concentrations and reduce vascular tone, with the largest antihypertensive effects occurring in cohorts with baseline hypomagnesemia or unmanaged hypertension
4. Oral Magnesium: Vascular tone; eNOS activation; calcium channel antagonism
5. Oral Magnesium: Meta-analysis of 34 RCTs (n=2,028)
6. Oral Magnesium: SBP -2.00 mmHg; DBP -1.78 mmHg; modest metabolic gains
</statements>

Begin the assessment now. Output only the JSON list, without any conversational text or explanations.