condition mean min max ZT0-3 0.13683975 0.0558455 0.217834 ZT4-7 0.113602 0.113602 0.113602 ZT8-11 0.111898 0.111898 0.111898 ZT12-15 0 0 0 ZT16-19 0.4938285 0.4938285 0.4938285 ZT20-23 0.27497699999999997 0.27497699999999997 0.27497699999999997