condition mean min max ZT0-3 11.893801666666667 10.710155 13.887450000000001 ZT4-7 11.5578 11.5578 11.5578 ZT8-11 7.780415 7.780415 7.780415 ZT12-15 9.58537 8.538129999999999 10.63261 ZT16-19 9.667259999999999 9.667259999999999 9.667259999999999 ZT20-23 11.4037 11.4037 11.4037