condition mean min max ZT0-3 0.0740581 0.0740581 0.0740581 ZT4-7 0.00464594 0.00464594 0.00464594 ZT8-11 0.03080725 0.03080725 0.03080725 ZT12-15 0.0310636 0.0310636 0.0310636 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0293187 0.0293187 0.0293187