condition mean min max ZT0-3 11.386059999999999 11.156369999999999 11.615749999999998 ZT4-7 25.21575 25.21575 25.21575 ZT8-11 38.72155 38.72155 38.72155 ZT12-15 0 0 0 ZT16-19 43.29065 43.29065 43.29065 ZT20-23 26.3549 26.3549 26.3549