condition mean min max ZT0-3 277.3 277.3 277.3 ZT4-7 231.1 231.1 231.1 ZT8-11 268.55 268.55 268.55 ZT12-15 306.55 306.55 306.55 ZT16-19 268.3 268.3 268.3 ZT20-23 344.95 344.95 344.95