condition mean min max ZT0-3 5.05378 4.8142700000000005 5.29329 ZT4-7 6.2808600000000006 6.2808600000000006 6.2808600000000006 ZT8-11 4.176195 4.176195 4.176195 ZT12-15 0 0 0 ZT16-19 5.836245 5.836245 5.836245 ZT20-23 6.64996 6.64996 6.64996