condition mean min max ZT0-3 15.10628 12.57976 17.6328 ZT4-7 4.736155 4.736155 4.736155 ZT8-11 4.08453 4.08453 4.08453 ZT12-15 0 0 0 ZT16-19 8.050245 8.050245 8.050245 ZT20-23 7.000355 7.000355 7.000355