condition mean min max ZT0-3 15.034739 15.034739 15.034739 ZT4-7 14.700258 14.700258 14.700258 ZT8-11 14.5387725 14.5387725 14.5387725 ZT12-15 13.239129 13.239129 13.239129 ZT16-19 14.1193415 14.1193415 14.1193415 ZT20-23 14.5774485 14.5774485 14.5774485