condition mean min max ZT0-3 278.3 278.3 278.3 ZT4-7 318.1 318.1 318.1 ZT8-11 419.65 419.65 419.65 ZT12-15 381.35 381.35 381.35 ZT16-19 342.75 342.75 342.75 ZT20-23 268.4 268.4 268.4