condition mean min max ZT0-3 11.112442 11.112442 11.112442 ZT4-7 10.7181605 10.7181605 10.7181605 ZT8-11 11.890507 11.890507 11.890507 ZT12-15 12.6149895 12.6149895 12.6149895 ZT16-19 11.583156 11.583156 11.583156 ZT20-23 13.9164675 13.9164675 13.9164675