condition mean min max ZT0-3 13.885668 13.885668 13.885668 ZT4-7 14.346499 14.346499 14.346499 ZT8-11 14.9266755 14.9266755 14.9266755 ZT12-15 13.4278835 13.4278835 13.4278835 ZT16-19 15.498981 15.498981 15.498981 ZT20-23 14.2997045 14.2997045 14.2997045