condition mean min max ZT0-3 96.043466 96.043466 96.043466 ZT4-7 93.476272 93.476272 93.476272 ZT8-11 140.0647035 140.0647035 140.0647035 ZT12-15 163.8584975 163.8584975 163.8584975 ZT16-19 194.4546565 194.4546565 194.4546565 ZT20-23 138.3893095 138.3893095 138.3893095