Unverified90% confidenceDecision RuleTime unknown

DEET浓度20-30%可提供约5-6小时防护，浓度超过30%后有效时长增幅极小，日常城市及景区选20%浓度即够用，无需盲目追求高浓度

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Unverified户外长时间徒步/丛林活动应选DEET浓度20-30%的产品以获得4-6小时持效，城市日常通勤或短时户外用10%浓度或派卡瑞丁即可，高浓度反增皮肤刺激和溶解塑料/合成纤维风险75% similar Unverified前往东南亚、非洲等登革热/疟疾高发区，选DEET浓度≥30%的产品，可提供约6小时防护；日常城市公园活动DEET 10-15%即可维持约2小时74% similar

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