condition mean min max ZT0-3 14.121 13.80105 14.44095 ZT4-7 11.024149999999999 11.024149999999999 11.024149999999999 ZT8-11 16.5181 16.5181 16.5181 ZT12-15 0 0 0 ZT16-19 17.3571 17.3571 17.3571 ZT20-23 15.584050000000001 15.584050000000001 15.584050000000001