Interface DurabilityEligibility

interface DurabilityEligibility {
    comparisonSegments: "halves" | "outer-thirds";
    earlySampleCount: number;
    eligible: boolean;
    hardZoneRatio: number | null;
    lateSampleCount: number;
    outputCoefficientOfVariation: number | null;
    reason: DurabilityEligibilityReason;
    validSampleCount: number;
}