condition mean min max ZT0-3 9.47230288425 9.2975060375 9.647099731 ZT4-7 4.99365440025 4.4502906745 5.5370181259999995 ZT8-11 4.9661745865 4.8286406 5.1037085730000005 ZT12-15 5.37650973025 4.8938579220000005 5.8591615384999995 ZT16-19 8.81898145025 6.831652061 10.8063108395 ZT20-23 13.7226178525 13.18986582 14.255369885