condition mean min max ZT0-3 0.3153720666666667 0.0403177 0.5949655 ZT4-7 1.388825 1.388825 1.388825 ZT8-11 0.6617805000000001 0.6617805000000001 0.6617805000000001 ZT12-15 0.579413 0.551804 0.607022 ZT16-19 0.1856295 0.1856295 0.1856295 ZT20-23 0.24884 0.24884 0.24884