condition mean min max ZT0-3 9.457699999999999 5.90785 11.42145 ZT4-7 5.0661000000000005 5.0661000000000005 5.0661000000000005 ZT8-11 4.4746500000000005 4.4746500000000005 4.4746500000000005 ZT12-15 11.168777500000001 10.524255 11.8133 ZT16-19 9.728725 9.728725 9.728725 ZT20-23 12.4895 12.4895 12.4895