condition mean min max ZT0-3 135.39999999999998 135.39999999999998 135.39999999999998 ZT4-7 268.7 268.7 268.7 ZT8-11 266.6 266.6 266.6 ZT12-15 252.0 252.0 252.0 ZT16-19 200.2 200.2 200.2 ZT20-23 153.3 153.3 153.3