condition mean min max ZT0-3 22.211875 22.1864 22.23735 ZT4-7 16.280450000000002 16.280450000000002 16.280450000000002 ZT8-11 15.891099999999998 15.891099999999998 15.891099999999998 ZT12-15 0 0 0 ZT16-19 20.84615 20.84615 20.84615 ZT20-23 15.4358 15.4358 15.4358