condition mean min max ZT0-3 398.462826 398.462826 398.462826 ZT4-7 318.573503 318.573503 318.573503 ZT8-11 392.411237 392.411237 392.411237 ZT12-15 548.039749 548.039749 548.039749 ZT16-19 337.172987 337.172987 337.172987 ZT20-23 334.1365605 334.1365605 334.1365605