condition mean min max ZT0-3 11.234085 11.234085 11.234085 ZT4-7 12.1335 12.1335 12.1335 ZT8-11 13.231558499999998 13.231558499999998 13.231558499999998 ZT12-15 10.9530785 10.9530785 10.9530785 ZT16-19 11.415917499999999 11.415917499999999 11.415917499999999 ZT20-23 11.395321 11.395321 11.395321