Erjingwan Extracts Exert Antiaging Effects of Skin through Activating Nrf2 and Inhibiting NF-B

Figure 5

The formula of primary irritation index (PII) is [∑(score ×No. of responses)]/20 (No. of total subjects)×1 (total stimulus evaluation times). Criteria of judgment were set according to CTFA/ICDRG guideline, text book of contact dermatitis (Table 2). P < 0.05; P < 0.01. Data were shown as mean ± SD.