condition mean min max ZT0-3 654.05125 609.5185 698.584 ZT4-7 540.4465 540.4465 540.4465 ZT8-11 580.0965 580.0965 580.0965 ZT12-15 0 0 0 ZT16-19 442.97950000000003 442.97950000000003 442.97950000000003 ZT20-23 388.941 388.941 388.941