condition mean min max ZT0-3 12.742621 12.742621 12.742621 ZT4-7 13.2614625 13.2614625 13.2614625 ZT8-11 12.138943000000001 12.138943000000001 12.138943000000001 ZT12-15 11.924751 11.924751 11.924751 ZT16-19 14.179648 14.179648 14.179648 ZT20-23 12.1384205 12.1384205 12.1384205