condition mean min max ZT0-3 13.7719175 11.927085 15.61675 ZT4-7 7.248555 7.248555 7.248555 ZT8-11 7.1133999999999995 7.1133999999999995 7.1133999999999995 ZT12-15 0 0 0 ZT16-19 11.23265 11.23265 11.23265 ZT20-23 11.53221 11.53221 11.53221