condition mean min max ZT0-3 1.3818735 0.9876654999999999 1.599885 ZT4-7 1.7159900000000001 1.7159900000000001 1.7159900000000001 ZT8-11 5.69498 5.69498 5.69498 ZT12-15 2.3020224999999996 2.2506399999999998 2.353405 ZT16-19 3.186995 3.186995 3.186995 ZT20-23 3.0332 3.0332 3.0332