condition mean min max ZT0-3 29.9363 21.170299999999997 46.5734 ZT4-7 32.3414 32.3414 32.3414 ZT8-11 15.232700000000001 15.232700000000001 15.232700000000001 ZT12-15 13.65085 12.89565 14.40605 ZT16-19 15.8159 15.8159 15.8159 ZT20-23 22.2365 22.2365 22.2365