condition mean min max ZT0-3 5.845572499999999 5.344425 6.3467199999999995 ZT4-7 6.35995 6.35995 6.35995 ZT8-11 6.03362 6.03362 6.03362 ZT12-15 0 0 0 ZT16-19 16.57275 16.57275 16.57275 ZT20-23 9.913865000000001 9.913865000000001 9.913865000000001