condition mean min max ZT0-3 40.589213 40.589213 40.589213 ZT4-7 53.717750499999994 53.717750499999994 53.717750499999994 ZT8-11 53.095062999999996 53.095062999999996 53.095062999999996 ZT12-15 63.0674245 63.0674245 63.0674245 ZT16-19 54.6081555 54.6081555 54.6081555 ZT20-23 55.4592605 55.4592605 55.4592605