condition mean min max ZT0-3 1.27625625 1.0686675 1.483845 ZT4-7 1.21897 1.21897 1.21897 ZT8-11 1.903595 1.903595 1.903595 ZT12-15 0 0 0 ZT16-19 2.723605 2.723605 2.723605 ZT20-23 2.93012 2.93012 2.93012