condition mean min max ZT0-3 0.0276224 0.0276224 0.0276224 ZT4-7 0.023664249999999998 0.023664249999999998 0.023664249999999998 ZT8-11 0.0152495 0.0152495 0.0152495 ZT12-15 0.028830500000000002 0.028830500000000002 0.028830500000000002 ZT16-19 0.0487038 0.0487038 0.0487038 ZT20-23 0.0224781 0.0224781 0.0224781