condition mean min max ZT0-3 14.97795 14.085 16.6766 ZT4-7 11.5352 11.5352 11.5352 ZT8-11 11.366 11.366 11.366 ZT12-15 15.0298 12.873999999999999 17.1856 ZT16-19 13.3005 13.3005 13.3005 ZT20-23 17.914450000000002 17.914450000000002 17.914450000000002