condition mean min max ZT0-3 208.608926 208.608926 208.608926 ZT4-7 288.239141 288.239141 288.239141 ZT8-11 326.267338 326.267338 326.267338 ZT12-15 234.8275095 234.8275095 234.8275095 ZT16-19 310.8766895 310.8766895 310.8766895 ZT20-23 280.5280925 280.5280925 280.5280925