condition mean min max ZT0-3 233.75 233.75 233.75 ZT4-7 443.3 443.3 443.3 ZT8-11 424.15 424.15 424.15 ZT12-15 418.35 418.35 418.35 ZT16-19 326.65 326.65 326.65 ZT20-23 223.35 223.35 223.35