condition mean min max ZT0-3 31.133725 25.99875 36.268699999999995 ZT4-7 19.282600000000002 19.282600000000002 19.282600000000002 ZT8-11 15.00405 15.00405 15.00405 ZT12-15 0 0 0 ZT16-19 21.6309 21.6309 21.6309 ZT20-23 32.169200000000004 32.169200000000004 32.169200000000004