condition mean min max ZT0-3 0.117082 0.0 0.234164 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.159793 0.0 0.319586 ZT20-23 0 0 0