condition mean min max ZT0-3 28.682583747499997 25.837823184999998 31.52734431 ZT4-7 17.1458871175 16.211164735 18.080609499999998 ZT8-11 10.3446415975 9.070816353 11.618466842 ZT12-15 14.09393707775 10.0046467455 18.18322741 ZT16-19 24.044981565 22.817227574999997 25.272735555 ZT20-23 26.4457547375 25.752309715 27.13919976