condition mean min max ZT0-3 11.439599999999999 11.439599999999999 11.439599999999999 ZT4-7 7.517435 7.517435 7.517435 ZT8-11 7.02504 7.02504 7.02504 ZT12-15 8.64262 8.64262 8.64262 ZT16-19 12.323699999999999 12.323699999999999 12.323699999999999 ZT20-23 12.38185 12.38185 12.38185