condition mean min max ZT0-3 13.254291 13.254291 13.254291 ZT4-7 12.7658855 12.7658855 12.7658855 ZT8-11 14.354432 14.354432 14.354432 ZT12-15 14.2117145 14.2117145 14.2117145 ZT16-19 14.3859505 14.3859505 14.3859505 ZT20-23 16.2417795 16.2417795 16.2417795