condition mean min max ZT0-3 0.90474 0.63365 1.06798 ZT4-7 0.405343 0.405343 0.405343 ZT8-11 0.21068900000000002 0.21068900000000002 0.21068900000000002 ZT12-15 1.04805575 0.5751014999999999 1.52101 ZT16-19 0.931055 0.931055 0.931055 ZT20-23 0.752204 0.752204 0.752204