condition mean min max ZT0-3 10.44407 10.44407 10.44407 ZT4-7 6.625305 6.625305 6.625305 ZT8-11 4.97986 4.97986 4.97986 ZT12-15 10.31419 10.31419 10.31419 ZT16-19 12.9807 12.9807 12.9807 ZT20-23 14.9498 14.9498 14.9498