condition mean min max ZT0-3 13.970737 13.970737 13.970737 ZT4-7 12.7869405 12.7869405 12.7869405 ZT8-11 12.479865499999999 12.479865499999999 12.479865499999999 ZT12-15 14.268224499999999 14.268224499999999 14.268224499999999 ZT16-19 14.3254555 14.3254555 14.3254555 ZT20-23 11.612228 11.612228 11.612228