condition mean min max ZT0-3 16.8848 15.6341 18.1355 ZT4-7 7.30232 7.30232 7.30232 ZT8-11 18.499 18.499 18.499 ZT12-15 0 0 0 ZT16-19 30.857999999999997 30.857999999999997 30.857999999999997 ZT20-23 24.12675 24.12675 24.12675