condition mean min max ZT0-3 0.3360435 0.241137 0.43095 ZT4-7 0.307808 0.307808 0.307808 ZT8-11 0.246786 0.246786 0.246786 ZT12-15 0 0 0 ZT16-19 0.346893 0.346893 0.346893 ZT20-23 0.3485165 0.3485165 0.3485165