condition mean min max ZT0-3 38.2141 37.059200000000004 39.369 ZT4-7 15.101099999999999 15.101099999999999 15.101099999999999 ZT8-11 14.53065 14.53065 14.53065 ZT12-15 0 0 0 ZT16-19 20.5287 20.5287 20.5287 ZT20-23 28.415 28.415 28.415